The Best Swimsuit for Lap Swimming: A Practical Guide for Men

Most men who start swimming laps make the same mistake. They grab the shorts they wore on holiday, or the pair they bought for a beach trip three summers ago, and figure it will do for the pool.

It will not do. Not for long.

The wrong swimwear adds drag to every stroke, degrades within weeks of regular pool use, and creates enough distraction — adjusting, riding up, shifting on the push-off — that you are managing your kit instead of focusing on your swim. For a casual splash, that barely matters. For anyone training with any consistency, it costs real effort on every lap.

This guide is written for men who swim laps with purpose. Whether you are doing three sessions a week for general fitness, building aerobic base for a triathlon, or simply serious enough about your pool time to want kit that matches that seriousness, by the end of this article you will know exactly which swimsuit style suits your training, what fabric to look for, what to ignore, and how to make the right suit last.

Why the Right Swimsuit Matters for Lap Swimming

Water is approximately 800 times denser than air. That density is why swimming is such an effective workout. It is also why every small variable in your equipment has a measurable effect on how hard you work.

Loose fabric creates drag. Not theoretical drag — real, physical resistance on every stroke and every kick. A suit that bunches at the waist or balloons at the leg openings is adding resistance you then have to overcome. Across a 40-lap session, that adds up.

There is also the distraction cost. A suit that shifts on the push-off, or that rides up mid-set, or whose waistband rolls inward by the third set, pulls your attention away from stroke mechanics, breathing rhythm, and pacing. For experienced swimmers, that distraction is noise. For anyone working to improve, it actively interferes with the learning process.

Then there is durability. Pool water is chemically aggressive. Chlorine breaks down standard swimwear fabrics at a rate most swimmers do not anticipate. A suit that was not designed for repeated pool use will lose its elasticity, fade, and start to sag within weeks of regular training, not months. Buying the wrong fabric means buying the same suit again and again.

A correctly chosen, well-fitting training suit eliminates all three problems. It disappears. You stop thinking about it within the first few laps, and it stays that way through the last one.

The Four Main Swimsuit Styles: What They Are and Who They Are For

Swim Briefs

The brief covers the hips and upper thigh. Nothing more. It is the most minimal training suit available, and for a significant number of serious pool swimmers, it is the preferred one.

The reason is straightforward: less material means less drag surface, no restriction below the hip, and a direct, unobstructed connection to the water. Many swimmers describe wearing a brief as having better proprioceptive feedback — a sharper, clearer awareness of body rotation, kick mechanics, and position in the water. When there is less fabric interfering with the signal between your body and the water, your technique work becomes more precise.

Briefs are well suited to technique-focused sessions, high-volume training, and anyone who wants to maximise freedom of movement through the kick and hip rotation. Triathletes often prefer briefs for pool sessions for exactly this reason — the unobstructed kick conditions the same mechanics that carry over to open water.

Some men, particularly those new to structured lap swimming, feel self-conscious about the style. This is worth addressing honestly: in any serious pool environment — club lanes, masters sessions, early-morning fitness lanes — briefs are standard. No one notices, and within a few sessions, neither will you. If it is still a concern, both jammers and square-leg suits offer more coverage without meaningful performance compromise.

For a detailed look at briefs specifically — fit, sizing, fabric considerations, and selection guidance — see our full best men's swim briefs guide.

Jammers

The jammer extends from the waist to just above the knee. It is the most widely used training suit at club and fitness level, and for good reason: it strikes a natural balance between coverage, compression, and freedom of movement.

Jammers offer a degree of compression around the quadriceps and hamstrings that many swimmers find comfortable during longer or harder sets. They are versatile — comfortable enough for a 90-minute training session, structured enough to move between training and competitive use.

For most men stepping up from board shorts or casual swimwear for the first time, the jammer is the natural starting point. The coverage feels more familiar, the fit is forgiving enough to build confidence in the water, and the performance step up from recreational swimwear is significant.

One honest trade-off: some swimmers find that jammers create slight restriction through the knee drive on kick-intensive sets. This is subtle, and for most training swimmers it makes no practical difference. But it is why many experienced pool swimmers keep both a brief and a jammer in rotation — briefs for technique and drill work, jammers for higher-volume sets or sessions where the compression is welcome.

Square-Leg Suits

Less commonly discussed but worth knowing about, the square-leg suit is a middle position between the brief and the jammer. It extends a few centimetres down the thigh, similar in shape to a pair of cycling shorts, but purpose-built for the pool.

It offers more coverage than a brief without the full compression of a jammer. The fit is typically less structured, making it a comfortable option for men who want a modest, practical training suit without committing to either extreme of the spectrum.

Square-leg suits are a reasonable starting point for men who are new to performance swimwear and want to move away from board shorts without an abrupt style change. They are also a practical option for men who swim infrequently enough that the specifics of brief versus jammer feel like more consideration than the situation demands.

Board Shorts and Training Trunks: Why They Do Not Work for Lap Swimming

This section is not about judgement. If you are swimming occasional leisure laps, wear what you are comfortable in. But if you are training with any regularity, it is worth understanding what board shorts are actually doing in the water, because the answer is not nothing.

Board shorts are cut loose for comfort and movement out of the water. That same loose cut becomes drag the moment you start swimming. The excess fabric at the hips and thighs does not lie flat — it billows and resists. The mesh lining that many casual shorts include absorbs water, adds weight, and creates additional resistance against your legs with every kick.

In a 20-lap fitness session, the practical effect is that you work noticeably harder to cover the same distance. In a longer structured session, the compounding effect on fatigue is real.

The fabric degradation issue is equally significant. Casual swimwear is not engineered for regular chlorine exposure. The elasticity goes first — within four to six weeks of regular pool use, a standard swim trunk or board short will begin to sag, lose its shape, and sit incorrectly in the water. You will be replacing them frequently, and each replacement still comes with all the same drag and restriction problems.

Switching to a purpose-built training suit is not a complicated upgrade. It is a practical one, and the difference is immediate.

What to Look for in a Lap Swimming Suit

Fabric and Chlorine Resistance

This is the most important single decision you will make when choosing a training suit, and it is the one most men overlook.

Standard swimwear fabrics — Lycra and nylon blends, the kind used in most recreational and beach swimwear — degrade quickly under chlorine exposure. Elasticity drops, colour fades, and the suit begins to lose its structural shape. For a swimmer training three or four times a week, this can happen within four to six weeks.

Chlorine-resistant fabrics — typically high-polyester blends engineered specifically for repeated pool use — behave very differently. They hold their shape, retain their colour, and maintain the structural integrity of the fit over a training lifespan measured in months, not weeks. The polyester construction resists chlorine at a molecular level in a way that standard Lycra simply does not.

A practical test: if a suit does not explicitly state that it is made from chlorine-resistant or performance training fabric, assume it is not. For any man swimming more than twice a week, this is not a premium consideration. It is a basic requirement.

Fit and Range of Motion

A training suit should fit snugly, close to the body with no loose or bunching fabric, but should not constrict movement or dig in at any point.

Before you enter the water, run a simple check: raise each knee to chest height. The suit should not pull, resist, or create tension through the hip. Rotate your torso through your full stroke range. The waistband should stay flat and in position. Bend at the hip as you would for a dive entry — the fabric should move with you, not against you.

A correctly fitted suit disappears within the first few laps. A poorly fitted suit never does.

Specific things to check during a session: the waistband should not roll inward during flip turns. The leg openings should not chafe at the hip or ride up on the push-off. The suit should not sag or balloon when wet. Any of these indicate either the wrong size or the wrong construction for your body.

One important sizing note: training swimwear runs smaller than casual swimwear. Do not use your clothing size or shorts size as a reference. Measure around the fullest part of your hips with a soft tape measure and cross-reference with the brand's size guide. If you are between sizes, sizing up gives a more comfortable result for high-volume training. Sizing down gives a tighter, more streamlined fit for performance-focused sessions. For broader guidance on how swimwear should fit, see our swimsuit fit guide.

Durability: How Long Should a Training Suit Last?

A quality chlorine-resistant training suit, used three to four sessions per week, should maintain its fit and elasticity for approximately six to twelve months with proper care. This is significantly longer than a non-chlorine-resistant suit will last under the same conditions.

The care habits that extend suit lifespan are simple and consistent: rinse in cold, clean water immediately after every session to remove chlorine and salt residue. Allow it to air dry flat. Never wring it out, machine-dry it, or leave it in direct sunlight for extended periods. Avoid sitting on rough poolside or concrete surfaces in the suit — abrasion degrades fabric at the contact points faster than chlorine does.

Signs that a suit needs replacing: visible sagging at the waist or leg openings, loss of elasticity when you stretch the fabric, material that has become translucent or changed in texture. Any of these mean the structural integrity of the fit is gone, and the suit is no longer performing as a training tool. For detailed care instructions, see our guide on how to wash your swimsuit.

Comfort Over Long Sessions

For a 45-minute fitness session, comfort is a baseline requirement. For a 90-minute training block, it becomes a performance factor.

A good training suit provides adequate support through an internal lining and a waistband that holds its position without constricting. There should be no chafing at the hip or leg openings, no pressure points at the waist, and no sensation of the suit tightening as the fabric saturates with water. Chlorine-resistant fabrics typically have a smoother texture than standard nylon alternatives — that smoothness directly reduces friction at contact points.

The goal is the same as with every other aspect of a well-chosen training suit: you stop noticing it. Your attention stays on your swimming, not on your kit.

Which Swimsuit Is Right for You? A Guide by Swimmer Type

Beginners and Occasional Lap Swimmers

If you are swimming once or twice a week for general fitness or as a starting point for a new training habit, a jammer or square-leg suit is usually the right starting point. More coverage, a familiar silhouette, and still a meaningful step up from board shorts or casual swimwear.

Prioritise chlorine-resistant fabric even at entry level. It protects the investment and means you are not replacing the suit after a month. The rest — brief versus jammer, compression levels, fit preferences — will become clearer after a few weeks of regular pool time.

Avoid board shorts. Even for a beginner doing gentle laps, the drag and degradation issues make them an active hindrance rather than a neutral choice.

Regular Training Swimmers (Three to Five Sessions Per Week)

At this volume, fabric durability and fit stability move from nice-to-have to non-negotiable. A non-chlorine-resistant suit will need replacing within weeks, and the cost — both financial and practical — compounds quickly.

Most regular training swimmers end up with both a brief and a jammer in rotation. Briefs for technique-focused sets, drill work, and sessions where unobstructed kick mechanics are the priority. Jammers for higher-volume sets, longer sessions, or when more coverage and compression is preferred.

This is not a complicated system. Two suits, rotated through the week, is both practical and common at club and masters level.

Triathletes Training for the Swim Leg

Pool training for triathlon is not about simulating race conditions. It is about building the underlying swim fitness, kick mechanics, and feel for the water that will then be applied, through a wetsuit or trisuit, in the race itself.

For pool sessions, a brief or jammer is the standard choice. Briefs are particularly well suited to triathlon pool training because the unobstructed kick conditions the same hip-drive mechanics that carry directly to open water swimming. Jammers work equally well for longer threshold sets or recovery sessions.

The question of what to wear on race day — trisuit, wetsuit, or a combination — is separate from what belongs in the pool during training. A quality pool training suit and race day gear serve entirely different functions; there is no reason to conflate the two.

For a complete overview of the training equipment that supports triathlon swim preparation, see our essential guide to triathlon swim gear.

Pool Training vs. Open Water: Does Your Swimsuit Choice Change?

For pool lap sessions, the answer is no. A brief or jammer remains the right choice regardless of whether you are also training for open water events, triathlons, or longer distance swims.

Open water introduces different variables that the pool cannot replicate — temperature, navigation, sighting, and the specific physical demands of wetsuit swimming. For cold water open water racing, a wetsuit typically governs the swimwear question entirely. For triathlon, race day usually means a trisuit.

None of this changes what belongs in the lane. The pool training suit is a technique and fitness tool. It conditions the mechanics — kick, rotation, stroke efficiency — that then carry over to whatever context you race in. Thinking of the pool suit and race day gear as separate pieces of kit serving separate purposes is the right frame.

What the pool suit needs to do — fit precisely, resist chlorine, stay in place through a full training session — is the same regardless of whether the swimmer is training for a local open water event or a full-distance triathlon.