Learning how to take care of your swimsuit is the difference between one that lasts a season and one that sags, fades, and goes see-through in a month. Chlorine is the enemy, and a few simple habits — mostly just rinsing right away — dramatically extend a suit’s life. Here’s the easy routine.

The short answer

To take care of your swimsuit, rinse it in cool, clean water immediately after every swim to flush out the chlorine (or salt), then hand wash it with a gentle soap and dry it flat in the shade. Avoid the washing machine, the dryer, wringing, and hot water — heat and harsh handling destroy the stretchy fibers. Chlorine is what breaks suits down, so rinsing right away is the single most important habit.

Why suits wear out

Swimsuit fabric gets its stretch from elastic fibers, and chlorine slowly attacks those fibers — that’s what causes the fading, sagging, and thinning that make a suit give out. Salt water, sunscreen, body oils, heat, and rough handling speed it up. So swimsuit care is really about minimizing chlorine’s contact time and treating the fabric gently.

The simple care routine

  1. Rinse immediately after every swim. As soon as you’re out, rinse the suit in cool, clean water — ideally before it even dries. This flushes out chlorine before it can do damage. This one step matters most. If you can’t get to a shower, even a quick rinse at a poolside tap or a soak in the water fountain of a water bottle helps; the goal is simply to get clean water through the fabric soon.
  2. Hand wash regularly. Every few swims (or after each, if you can), gently hand wash in cool water with a mild soap or a dedicated swimwear wash. No harsh detergent. Swish it around, let it soak a few minutes, and press the water through the fabric rather than scrubbing.
  3. Don’t wring it. Squeeze gently or press it in a towel to remove water — wringing stretches and stresses the fibers and can leave permanent creases in the elastic.
  4. Dry flat, in the shade. Lay it flat or hang it out of direct sun. Sun and heat degrade the fabric, and hanging a heavy wet suit can stretch it out of shape — especially over a thin rail or a single hook.

A good habit: keep the wet suit out of a sealed bag. If you must pack it away damp, wrap it loosely in a dry towel rather than sealing it in plastic, and rinse and dry it properly as soon as you get home.

What to avoid

  • The washing machine and dryer — the agitation and, especially, the dryer’s heat wreck the elastic fast. Hand wash and air dry.
  • Hot water and hot surfaces — no hot tubs in your good suit, and don’t leave it baking on a hot deck or in a hot car.
  • Sitting in a wet, balled-up suit in your bag — let it breathe and dry.
  • Rough surfaces — pool edges and concrete can snag and pill the fabric.

A couple of extra tips

  • Rotate two suits if you swim often, so each fully dries and rests between uses — they’ll both last longer. Elastic fibers recover their stretch better with a full rest day between swims.
  • Choose chlorine-resistant fabric for a frequent-use suit from the start; it’s built to withstand more (see how to choose a swimsuit for swimming).
  • Treat a regular-fabric fitness suit as a consumable — even with great care, chlorine wins eventually, so it’s normal to replace them periodically.
  • Skip the hot tub in your good suit. The combination of heat and heavy chlorine or bromine is unusually hard on the fabric and can wreck a suit faster than months of ordinary lap swimming.

Salt water and sunscreen

Chlorine isn’t the only culprit. If you swim in the ocean, salt and sand are abrasive and drying, so rinse just as diligently after sea swims. Sunscreen, body lotion, and natural body oils also break down elastic over time and can stain lighter fabrics — another reason a prompt rinse and regular gentle wash pays off. The same care extends to the rest of your kit; a quick rinse keeps a swim cap supple and stops it getting sticky, too.

Knowing when a suit is done

Even with perfect care, a swimsuit has a lifespan, and it’s useful to spot the signs so you’re not caught out mid-swim:

  • It’s gone see-through or thin when stretched — hold it up to the light; if the weave has thinned, especially across the seat, it’s time.
  • The elastic has given up — sagging straps, a loose neckline, or leg openings that no longer sit flat mean the fibers are spent.
  • It bags out the moment it’s wet and won’t stay put no matter how you adjust it.

None of this reflects poor care — it’s just what chlorine eventually does. Retiring a tired suit to lounging or gardening duty and swimming in a fresh one keeps you comfortable and covered.

The next small step

Build the one habit that matters most: rinse your suit in cool water the moment you finish swimming, before it dries. Do just that consistently and your suits will last noticeably longer. For the rest of your kit, what you need to start swimming keeps it simple.