Chlorine-Resistant Swimwear Fabric

You've probably had a customer complain their suit faded and went slack after a month of pool swimming. Chlorine did that, and the fix is a fabric decision made before the first cut.

This page covers chlorine-resistant swimwear fabric — why chlorine wrecks ordinary swim fabric, which blends survive it, and the numbers we hold at the mill.

Why Chlorine Destroys Ordinary Swimwear

Chlorine in pool water forms an acid that attacks fibres and dye at a molecular level. Three things follow, fast:

• Colours fade and dull
• Elastane breaks down, so the suit loses stretch and shape
• The fabric thins and starts to sag

Standard spandex-heavy blends show this inside 10-20 pool sessions. That's the baggy, washed-out look nobody wants on a returned garment.

The Blends That Hold Up

Fabric	Chlorine resistance	Best use
Polyester / Elastane (82/18)	High, 100+ hrs	Pool, competition, lessons
PBT-based knits	Very high	Competitive racing suits
Nylon / Elastane	Lower	Fashion swim, beach

We run polyester-elastane as our pool default. Polyester's molecular structure naturally resists chlorine, so it keeps its colour, compression and shape long after nylon has given up. For serious racing programs, a PBT blend pushes chlorine life further still.

What ‘100+ Hours’ Means for Your Customer

A pool-grade polyester-elastane holding 100+ hours of chlorine translates to roughly 2-3 times the usable life of a standard suit. For a swim-team parent or a lap swimmer, that's a suit that survives a season of daily practice instead of dying by mid-summer.

Chlorine resistance pairs with the other swim non-negotiables — UPF 50+ and four-way stretch. See the combined build on the Swimwear Fabric product page, how it all fits together in our swimwear fabric sourcing guide, and fibre choice in our swimming costume material guide.

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