How to Make Swimwear Last More Than One Season

Chlorine, salt and sunscreen each destroy swimwear in a different way. A two-minute habit prevents most of it.

How to Make Swimwear Last More Than One Season

Swimwear rarely wears out from swimming. It wears out from what happens in the hour after.

The three things that destroy a swimsuit

Chlorine

Chlorine attacks elastane — the fibre that gives swimwear its stretch and recovery. As it breaks down, the suit stops springing back, goes baggy at the seat and bust, and eventually turns slightly transparent when stretched.

This is cumulative and irreversible. You can't restore elastane once it's gone; you can only slow the damage.

Salt water

Salt crystallises in the fabric as it dries. Those crystals are abrasive, and they cut the fibres from the inside every time the suit flexes. Salt also accelerates fading in bright colours and dark prints.

Sunscreen and body oils

The oils in sunscreen stain — particularly whites, pastels and anything with avobenzone, which leaves a stubborn yellow-orange mark. Oil also degrades elastic over time.

The routine that prevents most of it

It takes two minutes.

  1. Rinse in cold fresh water immediately. Not later, not at the end of the day. Before the salt dries or the chlorine sets. A shower rinse while you're still wearing it is fine.
  2. Press, don't wring. Wringing permanently deforms the elastic. Squeeze the water out by pressing the suit between your palms, or roll it in a towel and press.
  3. Dry flat, in the shade. Hanging a wet suit by its straps stretches them under the weight of the water. Direct sun fades colour and degrades elastic — the same UV that burns your skin damages the fabric.

What to avoid

  • The washing machine, even on delicate. The agitation and the drum stretch the fabric.
  • The tumble dryer. Heat is the fastest way to kill elastane.
  • Hot tubs, where hot water and high chlorine combine — this is the single harshest environment for a swimsuit.
  • Sitting on rough concrete or pool edges in a suit. It pills and snags the fabric on the seat, which is the most common visible wear point.

Washing properly

Every few wears, hand wash in cool water with a small amount of mild soap or a dedicated swimwear wash. Never use fabric softener — it coats the fibres and destroys the suit's ability to recover its shape.

Rotate your suits

The elastic needs roughly 24 hours to fully recover its shape between wears. Wearing the same suit two days running is one of the main reasons a favourite suit goes baggy first.

Two suits worn alternately last more than twice as long as one suit worn daily.

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Common questions

How do you stop a swimsuit stretching out?
Rinse it in cold fresh water immediately after swimming, press the water out rather than wringing it, and dry it flat in the shade instead of hanging it by the straps. Also rotate between two suits — elastic needs about 24 hours to recover its shape, so wearing the same suit two days running stretches it out fastest.
Can you machine wash swimwear?
It is best not to, even on a delicate cycle. The agitation and drum movement stretch the fabric and break down elastane. Hand wash in cool water with a mild soap, and never use fabric softener, which coats the fibres and stops the suit recovering its shape.
Why has my swimsuit gone see-through?
That is elastane breakdown, usually from chlorine. As the elastane degrades the fabric loses its recovery and thins when stretched. It cannot be reversed, but rinsing immediately after every swim and keeping the suit out of hot tubs and direct sun slows it considerably.
Does sunscreen stain swimwear?
Yes. Sunscreen oils stain light fabrics, and formulas containing avobenzone leave a yellow-orange mark that is very hard to remove. Let sunscreen absorb for 15 minutes before dressing, and rinse the suit as soon as you are out of the water.

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