The Science of Wetsuits: Buoyancy, Drag, and the Rules

In twenty years of coaching, the question I get asked most often isn’t “How do I swim faster?”—it’s “Coach, should I wear a wetsuit or not?”

Behind that question lie three layers: Can a wetsuit really make me swim faster? At what water temperature can I wear one, and at what temperature can’t I? Which one should I buy, and how do I take care of it? I once coached a student named A-Zhe who wore a secondhand wetsuit someone gave him for his first Penghu cross-sea triathlon. His shoulders got so restricted he couldn’t pull, he hyperventilated from nerves before the swim, and halfway through he nearly got pulled onto a rescue boat by the staff. After that, we spent an entire season rebuilding his relationship with the wetsuit—from sizing, to putting it on and taking it off, to breath control before entering the water. The next year, he hit his target time at the same race and told me with a grin: “Turns out I wasn’t bad at swimming—I just didn’t know how to use this suit.”

In this article, I want to lay out the science, the rules, and the practical know-how behind wetsuits from a coach’s perspective. Whether you’re a beginner preparing for your first triathlon or a veteran trying to move up in your age group, you’ll find something useful here. I won’t give you a bunch of vague adjectives—instead, I’ll lay out what I’ve seen firsthand coaching at Taiwan’s race venues like Penghu, Kenting, Sun Moon Lake, and Yilan, combined with findings from sports science literature, so you can judge for yourself.

Let me start with one concept I always cover on the first day of class: For the vast majority of age-group triathletes, swimming is not a “fitness problem”—it’s an “efficiency problem.” No matter how strong you are on the bike or the run on land, if your body position collapses in the water, your legs sink, and your pull doesn’t catch any water, all that fitness gets eaten up by drag. The reason wetsuits get so much attention in the triathlon world is precisely because they directly address this “efficiency” component. Once you understand that, all the science and practical advice that follows will make sense to you.

1. How a Wetsuit Actually Makes You Swim Faster

Let me give you the bottom line first: a wetsuit makes you faster not mainly because of “warmth,” but because of buoyancy and reduced drag. Warmth is just a side benefit—what really changes your swim speed is your body position in the water.

Buoyancy: Lifting Your Lower Body Up

The biggest enemy in swimming is drag, and one of the biggest sources of drag is a body that isn’t horizontal enough in the water. Many age-group athletes—especially cyclists or runners with large leg muscles—find that the moment they stop kicking, their hips and legs sink. Their body becomes a tilted wedge in the water, the frontal area increases dramatically, and drag goes up with it.

The neoprene foam material used in wetsuits contains countless closed air bubbles and has a lower density than water, which is like wrapping a life buoy around your torso and thighs. That buoyancy lifts your lower body, bringing you closer to horizontal and significantly reducing your underwater frontal area. This is also why wetsuits help the most for swimmers who “can’t float well and swim slowly”—because their body-position problems are the most severe, leaving the most room for improvement.

According to a review of sports science literature, of the total speed improvement from a wetsuit, buoyancy contributes roughly 60–70%, while reduced drag contributes 30–40%. This also explains a common observation: the worse your efficiency and the more naturally “sinky” you are, the more dramatic your improvement after putting on a wetsuit. Conversely, swimmers who already float well and have solid technique get relatively limited benefits.

Reduced Drag: The Glide Effect of a Smooth Surface

The outer layer of a wetsuit is usually treated with a special coating or texture that makes it smoother than human skin or a standard swimsuit, reducing the frictional drag of water passing over the body. Higher-end models also use varying thicknesses and textures on the forearms and shoulders—adding surface area for the catch on one hand, and reducing drag during the recovery phase on the other.

How Big Is the Improvement, Really

This is the key point I always remind my athletes about: the numbers depend on who you’re talking about. The range from the research literature is roughly as follows:

Study Context	Swim Speed / Time Improvement	Notes
Early combined studies	Approx. 5–7%	Generally refers to recreational swimmers in full-sleeve wetsuits
Regional-level swimmers (full-sleeve)	Approx. 7%	More refined technique, moderate room for improvement
National-level triathletes (full-sleeve)	Approx. 11%	Those with extensive open-water experience benefit noticeably
400 m pool test	Time reduced by approx. 6%	Speed roughly 0.07 m/s faster

(The above is a range compiled from the literature; actual results vary by individual—see references at the end.)

In plain terms: if you currently swim 1500 m in open water in 35 minutes, 5–7% means saving about 2 to 2.5 minutes. That magnitude is absolutely not something to dismiss in age-group competition—many people train hard all winter and improve by less than that. But also remember: this is an “upper bound,” not a guarantee. The better your technique and the more naturally buoyant you already are, the smaller the dividend you’ll collect.

I often joke with my athletes: “A wetsuit fixes half of your weaknesses—it doesn’t turn you into Michael Phelps.” It will close the gap between you and the swimmers ahead, but it won’t replace the fundamentals.

Why “Worse Swimmers Benefit More”

This point deserves more attention because it directly affects whether you should invest in a wetsuit and how much to invest. There’s a consistent finding in the literature: the worse your swimming efficiency, the higher your body density (the more prone you are to sinking), and the slower your speed, the greater your relative improvement from a wetsuit. Conversely, for swimmers with refined technique who already float well, a wetsuit is at best a nice bonus.

Let me illustrate with a comparison of two real students. Xiao-Hui is a woman who transitioned to triathlon from a running background—muscular, low body fat, and naturally one of those “sinky” people in the water. Without a wetsuit, her hips and legs dropped the whole way, and she swam 1500 m in nearly 40 minutes. The first time she put on a well-fitted full-sleeve wetsuit, just the fact that her body position was leveled out took nearly three minutes off her 1500 m—even more than the upper end of the literature, because her original problems were so severe that the room for improvement was especially large.

The other student, A-De, came from a swim team background with excellent feel for the water and high pull efficiency. Without a wetsuit, he could swim 1500 m in under 25 minutes. Wearing a wetsuit of the same grade, he was only about a minute faster. It’s not that the wetsuit didn’t work—it’s that he already handled the “buoyancy” and “drag” factors very well on his own, leaving little room for the wetsuit to help.

The practical takeaway for you is this: if you’re the kind of swimmer like Xiao-Hui who sinks the moment you stop kicking, a wetsuit is one of the highest-return investments you can make in your gear—worth carefully choosing a well-fitted one. If you’re a strong swimmer like A-De, a wetsuit is still worth wearing (in races where it’s allowed), but don’t rely on it for a huge leap in performance—your ceiling for growth still lies in your training on land and your overall pacing strategy.

Warmth: The Underrated Third Role That’s Critical for Safety

Earlier I said warmth is just a “side benefit”—that’s true in terms of the goal of “going faster.” But in cold water, warmth shifts from a nice-to-have to a safety baseline. Prolonged immersion in cold water causes your core temperature to drop—mild cases bring shivering and impaired judgment; severe cases bring hypothermia, cramping, and even drowning. The neoprene layer of a wetsuit creates insulation between your skin and the cold water, helping your core temperature last longer.

This is also why race organizations “mandate” wetsuits below a certain water temperature—not to make you faster, but to make sure you finish the swim alive. In Taiwan, during winter or early spring lake and river swim training, water temperatures can drop to the teens (Celsius). In those conditions, the wetsuit’s warmth role matters far more than its speed role—I’ll remind you of this again later.

2. Water Temperature Rules: When You Can and Can’t Wear One

This is the part people get most confused about and where they most often trip up before a race. A wetsuit isn’t something you can just wear whenever you want—each race system has clear water temperature rules, and violating them can mean disqualification.

World Triathlon (Age-Group) General Principles

Based on World Triathlon competition rules, for age-group athletes:

• Mandatory: When water temperature is below 16°C, a wetsuit is required equipment (risk of hypothermia in cold water).
• Prohibited: When water temperature is above approximately 28.8°C, wetsuits are prohibited (to avoid heat exhaustion).
• Middle range: Between those two, wearing one is permitted, but near the upper limit, some races have a special window where it’s “allowed but not eligible for rankings.”

For elite/professional athletes, the upper limit for wearing is usually stricter, around 21.9°C; this is because elite athletes swim faster, generate more heat, and the rules aim to ensure competitive fairness.

IRONMAN System Regulations

IRONMAN’s general principle for age-group athletes is roughly: wetsuits are permitted when the water temperature is below 24.5°C; if the water temperature is between 24.5°C and 28.8°C, the race may allow you to wear one in the “non-competitive division,” but if you do, you will not be eligible for age-group awards or World Championship slots. The upper limit for professional athletes is approximately 21.9°C.

Equipment Construction Restrictions

Regardless of the system, wetsuits themselves also have regulations:

• Maximum thickness 5mm: This is a common rule across major systems (World Triathlon, IRONMAN, USAT); exceeding it is a violation.
• Must not cover the face, hands, or feet: Wetsuits may only cover the torso and main parts of the limbs; they cannot extend to the palms, soles, or face.

Practical Judgment for Races in Taiwan

Triathlon races in Taiwan are mostly concentrated in summer, and venues like Penghu, Kenting, Yilan Plum Lake, and Sun Moon Lake often see summer water temperatures between 27–29°C. This means: many Taiwanese summer races actually fall on the boundary of “banned” or “allowed but not ranked.”

From my experience coaching athletes: don’t rely on gut feeling—always check the on-the-day measured water temperature and referee rulings announced at the pre-race briefing. I’ve encountered athletes who had practiced extensively in their wetsuits, only to have the water temperature measured at 29°C the day before the race, resulting in an outright ban and throwing their race-day mentality into chaos. So my principle is: during training, you must prepare both “with wetsuit” and “without wetsuit” pacing and mental plans. In Taiwanese waters, you can’t take the wetsuit for granted in summer.

Only in winter or early spring in northern Taiwan waters (e.g., cold-water lake swim training) do you have a better chance of falling into the mandatory-wearing range; at that point, the wetsuit shifts from a “speed tool” to a “safety gear.”

A Quick-Reference Table for Water Temperature Zones (Using Age-Group General Rules as an Example)

I’ve organized the rules above into a quick-reference table for you to consult before race day. Note that actual numbers may vary slightly by race; the final authority is the on-the-day technical briefing:

Water Temperature Range	Age-Group General Rule	What You Should Do
Below 16°C	Wetsuit mandatory	Prioritize warmth; watch for cold-shock response at the swim start
16–24.5°C	Allowed and ranked (common IRONMAN upper limit)	Wear normally; leverage the speed benefit
24.5–28.8°C	Boundary zone; may be “allowed but not ranked”	Check race ruling; prepare both plans
Above 28.8°C	Wetsuit prohibited	Use a swimsuit or speedsuit; practice no-wetsuit pacing

Elite/Professional athletes typically have a lower upper limit (around 21.9°C). If you aspire to compete in the competitive division, remember this line especially.

Why the Upper Limit Is a “Ban”

Some athletes ask me: “Wouldn’t it be more comfortable to wear it in warmer water? Why ban it?” The reason is heat. Wetsuits are inherently insulating; exercising in warm water causes your core temperature to rise rapidly, and with the legs covered and heat dissipation difficult, it can easily lead to heat exhaustion or even heatstroke. This is especially real in Taiwanese summer races—imagine 29°C seawater under the midday sun, then wrapping yourself in neoprene for high-intensity exercise. That’s not speed; that’s stepping into an oven. So the upper-limit ban is to protect you, not to make things difficult for you.

III. Practical Methods: How to Choose, Train, and Maintain

Choosing: Fit Always Matters More Than Brand

I’ve seen too many people spend big money on top-tier models but get the wrong size, ending up with something that’s both restrictive and ill-fitting. When choosing a wetsuit, fit comes first, material quality second, and brand last.

Key points for judging fit:

• Torso fit: The chest, abdomen, and lower back should not have large gaps where water can enter; water ingress adds weight and disrupts buoyancy balance.
• Shoulder mobility: When raising your arms in a swimming stroke position, there should be no obvious tightness or pulling at the shoulders—this was the main reason for A-Zhe’s first failure.
• Neck collar tightness: Too tight causes compression, triggering hyperventilation and panic; too loose lets in excessive water.
• Crotch and armpits: If these areas are too loose, they’ll trap water; if too tight, they’ll chafe and cause skin abrasions.

Beginner advice: If budget is limited, consider renting or buying an entry-level full-sleeve model first, and only upgrade once you’re sure you’ll stick with triathlon. Sleeveless models are more shoulder-friendly and suit athletes with poorer shoulder flexibility or those racing in warmer waters, but they offer slightly less buoyancy and warmth than full-sleeve versions.

Full-Sleeve vs. Sleeveless: A Comparison Table

Comparison Item	Full-Sleeve	Sleeveless
Buoyancy	Higher	Slightly lower
Warmth	Better, suited for cold water	Worse, suited for warmer water
Shoulder mobility	More restricted; needs shoulder-flexibility design	High freedom
Heat retention	More stuffy	More breathable
Suitable for	Those seeking speed, cold water, prone to sinking	Those with poor shoulder flexibility, warm-water regions, prone to overheating
Taiwan summer suitability	Depends on whether water temp allows	One of the more practical choices

My practical advice: if you mainly race in Taiwanese summers and have average shoulder flexibility, sleeveless is often the safer bet; but if you’ll race in colder-water events or overseas races, or if you’re the type who sinks the moment you stop kicking, the buoyancy dividend of full-sleeve will make you never want to go back.

Thickness Distribution: Thicker Isn’t Always Better

A good wetsuit’s thickness isn’t uniform. Typically, the torso and thighs are thicker (for buoyancy), while the shoulders and forearms are thinner (for mobility and water feel). This “zoned thickness” design is a key difference between high-end and entry-level models. Entry-level suits are often roughly the same thickness throughout—they float fine, but shoulder mobility and catch feel will be a notch below. If budget allows, this is a worthwhile upgrade.

Wearing Technique: Take It Slow, Don’t Yank

Putting on and taking off a wetsuit is a skill; there’s no rushing it. Here’s the routine I always walk beginners through:

1. Put plastic bags on hands and feet: Slip thin plastic bags over your palms and soles before putting on the suit to greatly reduce friction and prevent fingernails from snagging the material.
2. Pull up in stages: Calf → thigh → hips → torso, and at each stage, repeatedly pull the material toward the joint to leave room in the crotch and armpits. Never just grab one spot and yank hard.
3. Handle the shoulders last: Once the torso is in place, pull up the shoulders and zipper, confirming your arms don’t bind when raised overhead.
4. Check the neck collar: Leave one finger’s width of slack; adjust immediately if too tight.

Keep your fingernails trimmed short—this is the number one cause of punctured wetsuits.

Pre-Swim Acclimatization Workouts

A wetsuit changes your buoyancy and feel, so you must acclimatize in a controlled environment the first time—don’t wait until race day for your first swim in it. Here’s a four-week acclimatization example I give my athletes:

Week	Focus	Example Content
Week 1	Familiarize with buoyancy and breathing	In a pool or calm water wearing the wetsuit, swim slowly 4×100m, focusing on feeling the change in body position as your lower body is lifted
Week 2	Build rhythm	8×100m, pacing 5 sec/100m slower than usual, practicing gliding with a longer stroke length
Week 3	First open-water attempt	Calm lake swim or nearshore sea, swim continuously 800–1000m, practicing sighting
Week 4	Simulate race conditions	1500m in open water, simulating a crowded start, rounding buoys, and stripping the suit on exit

Transition practice for taking off the suit should be trained separately: after exiting the water, jog while unzipping and peeling the top down to your waist—this can save significant time in transition. My athletes even time themselves, working “from exit to wetsuit off” down to under 20 seconds.

Final-Week Checklist

In the week before a race, here’s what I have my athletes do regarding the wetsuit—feel free to copy this directly:

1. Check wetsuit condition: Inspect for tears, ensure the zipper runs smoothly, and confirm the neck collar Velcro still has enough grip.
2. Final practice of putting on and taking off: No long swim needed; the focus is rehearsing the feel of donning and doffing and timing the strip.
3. Prepare anti-chafe and lubrication: Apply petroleum jelly or dedicated lubricant to areas prone to chafing—back of the neck, armpits, ankles—before race day (avoid contact with the zipper).
4. Check race water temperature forecast: Many Taiwanese races announce recent water temperatures beforehand; mentally rehearse your pacing version for “if banned.”
5. Pack and position gear: Separate the wetsuit, goggles, and swim cap into waterproof bags so you’re not scrambling at transition.

Starting Swim Strategy: The First 200 Meters Determine Your Entire Race Mindset

Open-water swimming in a wetsuit is a completely different beast from the pool. With the crowding, churning water, poor visibility, plus the cold water and neck seal compression, many people’s heart rates spike straight to 165–175 bpm within the first two minutes, and then they panic for the rest of the swim.

My strategy is simple: Deliberately hold back for the first 200 meters, get your breathing and rhythm dialed in, then gradually build speed. Concretely, I start at the edge of the pack (avoiding the brawl zone in the dead center), and for the first few dozen strokes I use a “breathe every three strokes” or even “breathe every two strokes” pattern to stabilize my breathing rhythm. Once I feel my body leveled out by the wetsuit’s buoyancy and my catch connecting with the water, I slowly bring my pace up to the target range. This costs you less than 10 seconds, and in return you get a stable heart rate and clear decision-making for the entire race. It’s absolutely worth it.

Maintenance: Three Post-Use Actions Determine Lifespan

Wetsuits are consumable items, but with proper care they can last several more seasons. After each use, be sure to do these three things:

• Rinse with fresh water: Sea salt and lake impurities accelerate material degradation. After every use, rinse inside and out with fresh water (not hot water).
• Dry in the shade, never in direct sunlight: UV rays are the number one enemy of neoprene. Always air-dry in a ventilated, shaded area, and never expose to direct sun or use a dryer.
• Store flat or on a thick hanger: Avoid hanging by the shoulders on a thin wire hanger for long periods, which can deform the material. For long-term storage, lay it flat or fold it gently over a hanger.

Also, don’t skip rinsing after using the wetsuit as a toilet (many people “relieve” themselves inside for warmth before entering the water—this is common in open water, but you must thoroughly clean it after the race), and avoid contact with oils, sunscreen, motor oil, and other substances that can corrode the rubber.

Common Maintenance Myth-Busting

• “It’s going to get wet anyway, so a quick rinse is fine”: The damage from salt crystal buildup is cumulative. A half-hearted rinse is like slow-motion wear and tear.
• “I’m in a hurry, I’ll just use a hairdryer”: Hot air accelerates rubber aging and delamination. Better to take the extra time to air-dry.
• “I’ll just leave it in the trunk”: Summer trunk heat is like slow-roasting; it accelerates material degradation. For long-term storage, keep it in a cool, ventilated place.
• “A small tear is no big deal”: Small holes let water in, affect buoyancy balance, and can expand when pulled during swimming. Patch what can be patched, and replace when it’s time.

A well-maintained mid-range wetsuit can easily last three to five seasons; conversely, with careless maintenance, it might start delaminating, smelling, and losing elasticity after just a season or two. When you do the math, proper maintenance is actually the most cost-effective approach.

Four: Common Mistakes and Fixes

After years of coaching, I’ve compiled the most common mistakes into a comparison table you can use to diagnose yourself:

Common Mistake	Why It’s a Problem	The Fix
First time wearing it on race day	The buoyancy feel and neck seal compression are unfamiliar, easily causing panic	Start adapting at least 3–4 weeks in advance, including open-water sessions
Buying too big for comfort	Excess water adds weight and ruins buoyancy, making you slower	Fit is the top priority; it’s fine if it takes a bit more effort to put on and take off
Neck seal too tight	Compresses the carotid artery area, triggering hyperventilation	Leave one finger’s width of slack; do several deep exhales before starting
Tossing it aside unwashed after use	Salt and UV accelerate aging and odor	Rinse with fresh water and air-dry in the shade
Ignoring water temperature rules	May be banned or not count for rankings, causing mental collapse on race day	Check the measured water temperature before the race and prepare two contingency plans
Over-relying on buoyancy and skipping technique training	The wetsuit can’t compensate for weak fundamentals; it shows once it’s off	Still train balance and kicking without a wetsuit in regular practice

I especially want to expand on “over-reliance.” A wetsuit lifts your lower body, and over time some athletes get lazy about kicking and core stability. The moment they hit a race where wetsuits are banned, their form reverts instantly. My principle is: Do most of your training sessions without a wetsuit to build real skills; use the wetsuit only for specific adaptation sessions and pre-race simulations. That way, wearing it is a bonus, and taking it off won’t cause a collapse.

Another often-overlooked issue is hyperventilation at the start. Cold water plus neck seal compression makes many people feel breathless in the first few dozen seconds, with heart rates spiking above 160 bpm. They think something is wrong, but it’s actually just the normal cold-water reflex compounded by nerves. The fix is simple: before entering the water, splash cold water on your face and neck, do a few “long exhales” to let your body adapt, and deliberately slow down for the first 100 meters of the swim to stabilize your breathing rhythm before accelerating.

Five: Local Race Notes for Taiwan

Enough theory—let’s get practical. Taiwan’s triathlon scene has its own unique environmental conditions that directly affect your wetsuit decisions.

• Summer water temperatures run high: Taiwan’s mainstream triathlons mostly fall between April and October, and summer sea and lake temperatures often sit at 27–29°C. Many races hover right on the edge of “wearable but not counted for rankings” or even “banned.” This means you can’t treat the wetsuit as a given piece of gear—you absolutely must be able to race without it.
• Sea swims bring waves and currents: For sea races like Penghu or Kenting, you face waves and currents on top of water temperature. A wetsuit’s buoyancy is actually an advantage in waves, helping you maintain your position through the swells—but only if you’ve already adapted to open water and won’t panic at the first wave.
• Lake swims have poor visibility: For mass swims like Sun Moon Lake or Plum Lake, underwater visibility is poor, making sighting more important. A wetsuit’s buoyancy makes sighting less tiring when you lift your head—an often-overlooked benefit.
• Winter training is where warmth really matters: If you do open-water training in northern Taiwan or mountain lakes during winter, water temperatures can drop to the teens. Here, the wetsuit’s insulation is a safety baseline—always train with a buddy, watch your time, and don’t push your limits.

I usually advise my Taiwan athletes: Treat “with wetsuit” and “without wetsuit” as two separate formal skills to train. Given Taiwan’s water temperature reality, you might be allowed to wear one at a race this year and banned from the same race next year. You need both to be solid, or a ruling on race day can throw you off.

One more note on the perennial food and fueling issue: Taiwan races have early morning assembly times, and many people grab whatever they can or skip eating entirely before getting in the water. While the swim segment isn’t as easy to fuel during as the bike or run, fasting combined with cold-water stimulation can easily cause dizziness and cramping. Eating an easily digestible carbohydrate meal 2–3 hours before the start (like a rice ball, banana, or toast) is far safer than toughing it out on an empty stomach. This falls under overall race nutrition, so adjust based on your individual situation and professional advice.

Six: Action Plans for Athletes of Different Levels

Beginners (Preparing for Your First Triathlon)

• Confirm the race’s water temperature rules first—don’t buy a wetsuit only to find it’s banned.
• For gear, prioritize a well-fitting entry-level full-sleeve model; renting is an option if budget is tight.
• Focus on adaptation and putting it on/taking it off, not on pace. The goal is “finish safely, don’t panic.”
• Complete at least 2 open-water practice sessions in a wetsuit before race day.

Intermediate (Looking to Move Up in Your Age Group)

• Choose a model based on your weaknesses: if you tend to sink, pick a buoyancy-oriented model; if your shoulder flexibility is limited, consider a sleeveless option or one with good shoulder elasticity.
• Turn transition-area wetsuit removal into a reflex, aiming for under 20 seconds.
• Deliberately mix in no-wetsuit sessions during training to avoid technique regression.
• Learn to read pre-race water temperatures and prepare both “with/without wetsuit” pacing and mental scripts.

Advanced (Chasing Results or Long Distance)

• Invest in the highest-fit premium model; forearm catch panels provide real benefits for long-distance stroke length.
• For long-distance events like IRONMAN, pay attention to how water temperature rules affect ranking eligibility—factor this variable into your race selection for the season.
• Be even more meticulous with maintenance; a premium wetsuit is a significant investment, and proper care can extend its life by several seasons.
• Don’t forget: even for advanced athletes, the wetsuit’s bonus has its limits. Fundamentals are still the ceiling.

7. Frequently Asked Questions (FAQ)

Q: Is a thicker wetsuit more buoyant and faster?
Not entirely. The maximum thickness is 5mm, and buoyancy has a “diminishing returns” effect—being too buoyant can actually disrupt your feel for the water and your body position balance. A proper fit and improved body position matter more than simply chasing thickness.

Q: How do I choose between sleeveless and full-sleeve?
Full-sleeve offers better buoyancy and warmth, making it suitable for cold water and those chasing speed; sleeveless gives your shoulders more freedom and is less stuffy, making it ideal for warmer water regions and swimmers with poor shoulder flexibility. Since Taiwan summers tend to be hot, sleeveless is a practical choice for some athletes.

Q: I’m already a fast swimmer—do I still need a wetsuit?
For skilled swimmers who are naturally buoyant, the advantage is smaller, but in races where wetsuits are permitted, most people still wear one—because that 5% or so difference still matters in competition. Just don’t expect it to elevate you to a whole new level.

Q: Is it okay to borrow someone else’s wetsuit?
It’s fine for a quick trial to test the waters, but for an actual race, it’s strongly recommended to use one that fits you properly. A-Zhe’s lesson was that the borrowed wetsuit didn’t fit, and his shoulders got stuck.

Q: Is it normal to feel out of breath right after the start?
The cold-water reflex combined with nerves is very common. Splash water on your face before entering, exhale long and slow, and ease into your swim pace—it usually subsides within a minute or two. If severe discomfort persists, be sure to raise your hand for help and flip onto your back to float.

Q: Will the wetsuit make me dependent on buoyancy and cause my swimming to regress?
If you “only train in a wetsuit,” that risk is real. That’s why my principle is to do most training sessions without one, building up your kick, core stability, and balance; the wetsuit is reserved for acclimatization sessions and pre-race simulations. A tool is a tool, and skill is skill—train them separately.

Q: My neck and armpits keep getting chafed. What should I do?
First, confirm whether the size is too tight, then apply petroleum jelly or a dedicated lubricant to the friction-prone areas. If it’s a new suit, wearing it several times to let the material conform usually helps; if it remains severe, the cut may not suit your body type, and you should consider a different model.

Q: What’s the difference between renting and buying a wetsuit?
Renting is cheaper and lets you try different models, making it suitable for beginners who aren’t sure if they’ll stick with the sport long-term; the downsides are that it may not fit perfectly, and hygiene and wear conditions are hard to verify. If you’ve already committed to taking triathlon seriously, a well-fitted wetsuit of your own is a more cost-effective and safer investment in the long run.

Q: Can I apply sunscreen before putting on a wetsuit?
Try to avoid having sunscreen or oils come into large-scale direct contact with the inner layer of the wetsuit, as these can degrade the neoprene. If you need sun protection, apply it first, wait for it to absorb, then put on the wetsuit—and be sure to rinse thoroughly after the race.

Q: I’m very afraid of water and panic in open water. Will a wetsuit help?
The buoyancy does provide a sense of security—when you flip onto your back to float, the wetsuit will hold you steadily on the surface, which is a huge psychological support for people who fear water. But the fundamental solution remains gradual open-water acclimatization and breathing control; the wetsuit is an aid, not a free pass. If your panic is severe, consider practicing progressively with a coach or an experienced partner.

Conclusion

Back to A-Zhe’s story. In his second year, he hit his target time—not because the wetsuit was magical, but because he finally understood: a wetsuit is a tool, not magic. It uses buoyancy to correct your body position, its smooth surface to reduce drag, and in water temperatures where rules allow, it saves you precious minutes; but it can’t fix the fumbling of not knowing how to put it on, the panic you haven’t trained for, or the neglected fundamentals.

My advice remains the same: treat the wetsuit as part of your training—understand it, adapt to it, maintain it—rather than a last-minute lifesaver before race day. Choose the right size, practice putting it on and taking it off, understand water temperature, and still train the real fundamentals in your regular sessions—when all of these are in place, you’ll truly feel, the moment you hit the water, that this suit is on your side.

Taiwan’s waters offer a different character in every season, from the warm waters around Penghu in summer to the cooler lake swims in winter training, and the wetsuit’s role shifts accordingly. May you always know, before every dive, exactly why you’re wearing it and how to use it. See you in the water.

This article is educational content and does not replace individual assessment by a physician, physical therapist, or nutritionist.

References

• World Triathlon Competition Rules (race water temperature and equipment regulations): https://www.triathlon.org/uploads/docs/World_Triathlon_Competition_Rules_20221.pdf
• Is Swimmers’ Performance Influenced by Wetsuit Use? (PubMed, effect of wetsuits on swimming speed): https://pubmed.ncbi.nlm.nih.gov/30958047/
• The Impact of Wetsuit Use on Swimming Performance, Physiology and Biomechanics: A Systematic Review (MDPI systematic review): https://www.mdpi.com/2673-9488/2/4/16
• How Much Faster Does a Wetsuit Make You Swim? (Triathlete, magnitude summary): https://www.triathlete.com/gear/swim/how-much-faster-does-a-wetsuit-make-you-swim/
• Ironman Triathlon Wetsuit Rules & Temperature Cutoff (IRONMAN water temperature rules summary): https://deboerswim.com/blogs/updates/ironman-triathlon-wetsuit-rules

Related Reading

• The Science of Triathlon Wetsuits: Buoyancy, 18% Drag Reduction, and the Truth About Saving 10 Seconds per 100 Meters
• Wetsuit vs. Skin Swimming: The Complete Open-Water Apparel Strategy Guide for Triathletes
• The Complete Wetsuit Guide: Selection, Donning and Doffing, and Adjusting Your Swim Feel
• Legal Water Temperatures for Wetsuits and Buying Guide: Buoyancy Is Free Speed