The best swimsuit for lap swimming is the one that stays put, doesn’t drag, and survives the chlorine — which usually means a fitted, chlorine-resistant suit, not a fashion piece. Style matters far less than fit and fabric here. This guide covers exactly what to look for so you buy once and swim comfortably.
The short answer
For lap swimming, choose a snug, secure suit in a chlorine-resistant fabric (polyester or a poly blend like PBT), in a cut that stays firmly in place — a fitted one-piece for women, or jammers/briefs for men. Avoid loose suits, bikinis, and board shorts, which shift and drag. Prioritize fit and fabric durability over style, and you’ll get a suit that’s comfortable, fast, and lasts many months instead of sagging out in weeks.
Fabric matters most: go chlorine-resistant
Here’s the thing most people learn the hard way: chlorine destroys standard swimwear. The stretchy elastic fibers in regular fashion suits break down with repeated pool exposure, so a normal suit can sag, fade, and go thin in just a few weeks of frequent swimming.
The fix is a chlorine-resistant fabric — typically polyester or a polyester blend (often labeled “PBT” or marketed as chlorine-proof/chlorine-resistant). These:
- Last far longer in chlorinated water (often many times the life of standard fabric).
- Hold their shape and color much better.
- Cost a little more up front but save money over time.
If you swim laps regularly, this is the single most important feature. See how to take care of your swimsuit to make any suit last even longer.
Fit: snug, secure, and unrestrictive
A lap suit has one job during your set: stay exactly where it should.
- Snug and secure — it shouldn’t shift, ride up, or slip when you push off, turn, or stroke.
- Not restrictive — you should be able to reach, rotate, and breathe fully.
- Stays put — if you’re tugging at it between lengths, it’s too loose or the wrong cut for laps.
Do a quick move-test before buying: stretch, reach overhead, and bend to be sure nothing shifts or digs in. More on dialing in fit in how to choose a swimsuit for swimming.
Styles that suit lap swimming
- Women — fitted one-piece. The classic lap choice: secure, supportive, low-drag. Racerback and cross-back styles stay especially put and free your shoulders.
- Men — jammers or briefs. Jammers (mid-thigh) are popular and comfortable; briefs are minimal and low-drag. Both stay put far better than board shorts.
- Two-piece “athletic” sets (a secure sports-style top with fitted bottoms) can work for laps if — and only if — everything is snug and stays in place.
Skip for laps: loose board shorts (huge drag), bikinis and fashion two-pieces (shift and slip), and anything you have to keep adjusting. They’re fine for lounging, not for swimming.
What about drag and “tech” suits?
Racing tech suits are engineered for competition — expensive, tight, and not meant for everyday training. As a lap swimmer or beginner, you don’t need one. A well-fitting standard training suit in a chlorine-resistant fabric gives you all the low-drag, stay-put performance you need for fitness swimming.
How much to spend
You don’t need to spend a lot, but the sweet spot is a mid-range chlorine-resistant training suit — more durable than a cheap fashion suit, far less than a racing tech suit. Because chlorine slowly wears out even good suits, think of a training suit as a long-lasting consumable: buy quality fabric, care for it, and replace it when it finally gives out.
The next small step
Look for a fitted training suit specifically labeled chlorine-resistant (polyester/PBT), in a cut that stays secure, and do the move-test before you commit. Get the fabric and fit right, and you’ll have a comfortable, fast, long-lasting suit — and one less thing to think about every time you swim. Rounding out your kit? See what you need to start swimming.