A squad session can mean 90 minutes of hard work, repeated starts and turns, and thousands of metres in chlorinated water. The best swimwear for squad training is not the suit that looks best on the poolside for one session. It is the one that stays secure through kick sets, holds its shape after regular washing, and lets the swimmer focus on the next set rather than adjusting straps or waistbands.
For club swimmers, parents and coaches, the priority is simple: choose training kit built for regular pool use. Race suits have their place, but day-to-day squad swimming demands comfort, chlorine resistance and a fit that remains dependable week after week.
What makes the best swimwear for squad training?
Training swimwear needs to deal with far more than an occasional leisure swim. Chlorine, heat, friction from lane ropes and repeated stretching all work against fabric over time. A proper training costume, jammer or brief should be made from a durable performance fabric, ideally one designed to retain its shape and colour under frequent exposure to chlorinated water.
Look for fabrics commonly described as chlorine resistant or made for extended pool use. Polyester-rich fabrics are a strong choice for high-mileage swimmers because they generally cope better with chlorine than conventional elastane-heavy swimwear. They can feel firmer at first, but that structure is valuable when a swimmer is in the pool several times a week.
Fit matters just as much. Training kit should feel close to the body without restricting a full shoulder rotation, a deep breaststroke kick or a tight streamline. If a suit moves when the swimmer pushes off, it is too loose. If straps dig in, seams leave marks long after the session or movement feels limited, it is too small or the cut is not right for that swimmer.
Choose the right style for the swimmer
There is no single best cut for every squad swimmer. The right option depends on stroke, personal preference, club rules and how often the kit will be used.
Women’s and girls’ training costumes
A one-piece costume is the practical foundation for most female squad swimmers. It provides reliable coverage, stays in place during dives and turns, and is easy to wear under a tracksuit between sessions. For regular training, look for a medium or open back with supportive straps that do not slide off the shoulders.
Thin straps can offer excellent freedom of movement and are popular with experienced swimmers, particularly for freestyle and butterfly. However, a wider strap or more supportive back design may suit younger swimmers, breaststrokers, or anyone who prefers a more secure feel. A higher leg can reduce fabric bunching around the hip, while a more conservative leg height may feel more comfortable for junior swimmers or those new to squad training.
Training costumes from recognised performance brands such as Speedo, Arena and Funkita offer different fits, prints and back styles. The best choice is the one that fits the swimmer's body and training routine, not simply the style worn by another member of the lane.
Men’s and boys’ jammers, briefs and trunks
Jammers are a popular squad choice for male swimmers because the longer leg gives a streamlined, secure feel and works well for regular mixed-stroke training. They are especially common among competitive swimmers who want training kit that feels close to their race-day setup without using an expensive technical racing suit every day.
Briefs give complete freedom through the hip and are a long-standing favourite for swimmers who prefer minimal fabric and unrestricted movement. They can be ideal for long sessions, technical work and hot pool environments. Trunks sit between briefs and jammers in coverage, but check the leg opening carefully: a poorly fitted trunk can ride up during starts and turns.
For boys in growing stages, avoid buying several sizes up in the hope of making a suit last longer. Loose swimwear creates drag, can distract from technique and tends to wear unevenly. A correctly fitted suit will perform better, even if it needs replacing as the swimmer grows.
Fabric and durability: where training suits earn their value
A low-cost fashion swimsuit may seem attractive for a young swimmer who is growing quickly, but it can become a false economy if it fades, goes baggy or loses shape after a few weeks of squad sessions. Frequent swimmers need kit designed for the environment they train in.
Chlorine-resistant fabrics are particularly worthwhile for swimmers attending three or more sessions each week. They are also a sensible choice for holiday training camps, school squads and masters swimmers building mileage for an event. If swimming is once a week alongside lessons, a standard performance suit can be sufficient, but durability should still be high on the list.
Prints are not only about personality. Bright colours and bold designs can make it easier for parents and coaches to identify junior swimmers on a busy poolside. Darker colours, meanwhile, can be a practical option for swimmers who want a more understated club-training look. Both are valid choices, provided the fabric and fit are right.
How squad swimwear should fit
A training suit should be fitted, not compressed. Technical racewear is intentionally tight and often requires careful sizing, but daily training swimwear needs to be comfortable enough for repeated use. Swimmers should be able to reach into a full streamline, squat comfortably, and move through all four strokes without pulling or shifting.
For a one-piece, check that the straps are flat and secure, the chest and hips are covered comfortably, and there is no gaping at the back or around the legs. For jammers and briefs, the waistband should sit firmly without rolling, while the leg openings should lie flat rather than pinch.
Always use the brand's sizing guidance rather than relying on a usual clothing size. Performance swimwear sizing varies between brands, and age-based sizing is only a starting point for juniors. Taking a few minutes to measure can prevent the disappointment of a suit that is unsuitable before it has seen a pool.
Keep two training suits in rotation
For swimmers who train regularly, two suits are usually better than one premium suit worn every day. Rotating swimwear gives fabric time to dry fully and reduces the constant strain on the same seams and elastic. It also prevents a missed session because a suit is still damp in the kit bag.
A useful squad setup is a dependable plain or club-approved suit for routine sessions and a second option with a different fit or print for rotation. Swimmers attending early-morning sessions, weekend galas and evening training may benefit from a third suit during the busiest parts of the season.
After swimming, rinse the suit promptly in cool fresh water. Do not leave it rolled up in a wet towel or sealed inside a plastic bag, and avoid drying it on a radiator. These small habits make a noticeable difference to colour retention, elasticity and overall lifespan.
Training swimwear is not race swimwear
It is tempting to train in a technical kneeskin or high-compression racing jammer, particularly after an important gala. In most cases, save those suits for competition. Racewear is designed for performance over a limited number of swims, not the repeated chlorine exposure and daily handling of a full squad programme.
Training in regular performance swimwear also gives swimmers a clearer sense of their own body position and effort. A durable costume, jammer or brief should feel dependable, while the swimmer builds fitness and technique through the work rather than relying on race-suit compression.
A practical squad-buying checklist
Before choosing, make sure the swimwear meets these core needs:
- It is made for regular chlorinated pool use.
- The cut suits the swimmer's preferred strokes and coverage needs.
- It fits securely for dives, turns and underwater work.
- It matches any club colour, logo or kit requirements.
- The swimmer has a second suit available for rotation.
The strongest choice is the one a swimmer can put on before a demanding session without a second thought. At All4Swim, that means starting with durable performance swimwear, selecting the fit that works in the water, and keeping a reliable spare ready in the kit bag. When the suit does its job quietly, the swimmer can get on with theirs.