Most swimsuits are not worn out by swimming. They are worn out in the hours afterwards, rolled damp in a beach bag or a gym holdall, quietly stewing in everything they carried out of the water. The swim gets the blame. The journey home does the work.
Which is why the most useful thing you can do for a swimsuit costs two minutes and no money: rinse it in cool fresh water as soon as you are out. It is unglamorous advice, printed on every care label and followed by almost nobody, and it does more for the lifespan of a suit than any wash or storage trick that comes after it.
What comes out of the water with you
A swim knit is not a solid sheet. It is a mesh of fine yarn with a great deal of surface area, and when it is wet it holds liquid in three places at once: on the fibre, between the yarns, and in the gap between shell and lining. Whatever was dissolved in the pool or the sea is dissolved in all of it. Chlorine, salt, sunscreen, sand and body oils all travel home in the fabric, and a shake or a towel-dry moves almost none of it.
What people underestimate is what happens as it dries. Water evaporates; the things dissolved in it do not. A suit drying slowly in a warm bag is not getting cleaner — it is getting more concentrated, with everything it absorbed left against the fibre at rising strength, for hours, in exactly the warm damp conditions that speed chemical reactions up. An hour in a pool exposes a suit to dilute chlorine. An afternoon in a bag exposes it to concentrated chlorine.
A suit spends an hour in the water and five hours in what it brought home. The second half is the one you can do something about.
Salt, sunscreen and the limits of plain water
Sea swimmers often assume they are in the clear, and salt is genuinely gentler on elastane than chlorine. It is not harmless. As seawater dries, dissolved salt recrystallises inside the knit as hard microscopic grains sitting between fibres that are about to be stretched, folded and walked in — straightforward mechanical abrasion, and the reason an unrinsed beach suit has that stiff, slightly crunchy handle. Salt is hygroscopic too, pulling moisture from the air, so a salty suit stays damp far longer than a clean one.
Sunscreen is the one a rinse only half solves, and it is worth being honest about that. Modern formulas are built to resist water, which means the oils carrying the active filters are designed not to be lifted by it. A rinse removes the loose surface layer before it migrates deeper into the knit; it cannot degrease. Light colours in particular need a proper hand-wash in cool water with a mild detergent to avoid the yellowish cast that builds over a season. Avobenzone can also react with iron in hard water and leave rust-coloured marks that are far easier to prevent than to remove.
Two minutes, cool water, and no wringing
The rinse is a dilution job, not a cleaning job, so it rewards volume and contact rather than effort. Hold the suit under a cool tap, open the fabric out so water reaches inside the lining and the gusset rather than running over a folded lump, and squeeze gently through a few times. Keep it cool: heat relaxes the elastane you are protecting and helps oily residue spread rather than rinse away. Press the water out in a folded towel, never twist, and dry flat in the shade. The habit only sticks if it is easier than skipping it, which is mostly a matter of removing the decision.
- 01Rinse it while you are still wearing it — thirty seconds at the end of your shower and the job is done before you have thought about it.
- 02Soak the suit in clean water before you get into a pool. Fabric already full of fresh water takes up less chlorinated water.
- 03Keep a bottle of tap water in the car for days with no shower. A rough rinse beats a perfect one you skip.
- 04If a wet suit must travel, carry it loose in a mesh or cotton bag rather than rolled in a sealed one.
- 05Give it a hook, not the laundry basket. A suit that lives somewhere visible gets rinsed.
- 06Hand-wash in cool water with a mild detergent every few wears, and always after heavy sunscreen.
- 07Rotate two suits if you swim regularly, so each dries fully and recovers before it goes back in.
Where RIVA stands
Every RIVA shape is cut from one double-lined sculpting Italian jersey woven at a family mill on Lake Como, chosen partly because it is chlorine and UV-resistant and holds colour and shape across seasons rather than one good weekend. The shells are spun from regenerated ocean nylon and the seams are bonded, so there is no stitching to abrade as the fabric moves. None of that replaces the rinse. Good fibre slows the damage; rinsing removes the thing causing it. Our care advice has never been more complicated than this — cool water after every swim, a gentle hand-wash, no wringing, dry flat in the shade.