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Swim fabric that survives chlorine, not just the pool photo

Four qualities for training swimwear, competition training suits and resort ranges. Chlorine resistance, opacity in stretch and colour retention specified per quality.

Chlorine is a material problem, not a quality control problem

Chlorinated water attacks the elastic component first. A swim knit that photographs perfectly on delivery will go slack, chalky and see-through after a season of twice-weekly training if the yarn system is wrong. That is why swim is the one category where the specification has to name the chemistry, not only the weight.

What we specify for chlorine exposure

Chlorine-resistant qualities use a yarn and finishing route that resists the degradation that standard spandex suffers in chlorinated water — the same reason pool training suits and resort suits are not the same fabric. We state which of the two a quality is intended for, because a resort suit sold into a swim school fails in the first month.

Opacity in stretch

Swim fabric is worn at 4-way stretch in wet conditions, which is the worst case for opacity. Light colours need a denser knit or a lining. We test light colours stretched in water and can supply lining recommendations rather than leaving you to find out on a wet model.

Colour and salt

Chlorine and salt both attack colour, not only stretch. Ask for colourfastness results against chlorinated water and perspiration rather than a generic wash test — the wash test will pass on a fabric that fades in a pool.

Swatch pack

See the fabric before you commit

Thirteen knit qualities, posted in 3–5 days. Tell us the garment and the colour.

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4 qualities for swim

Match the quality to the garment, not the other way round

Chlorine-Resistant Swimwear KnitSwim

The pool quality. Built for repeated chlorinated exposure with colour and stretch retention stated.

80% Nylon / 20% Spandex · 210 gsm · 150 cm (59 in) · 4-way stretch

High-Compression Nylon Spandex 85/15Highest margin

Dense 85/15 for compression one-pieces and racing-training silhouettes.

85% Nylon / 15% Spandex · 250 gsm · 150 cm (59 in) · 4-way stretch

Athletic Mesh & Eyelet KnitBreathability

For side panels and back details that need airflow without transparency.

88% Polyester / 12% Spandex · 160 gsm · 160 cm (63 in) · 4-way stretch

Ultrafine 15D/20D Second-Skin Nylon2026 trend

Soft, light and smooth for resort ranges where hand-feel outranks chlorine exposure.

78% Nylon / 22% Spandex · 170 gsm · 155 cm (61 in) · 4-way stretch

Before you commit

Buyer questions

What makes swim fabric chlorine resistant?

The yarn system and finish, not the weight. Standard elastane degrades in chlorinated water; a chlorine-resistant knit is built and finished to resist that degradation. If a mill cannot tell you which of the two a quality is, it is the standard one.

Is polyester or nylon better for swimwear?

Polyester generally holds colour and chlorine resistance more predictably at a lower cost. Nylon gives a softer, more premium hand and better drape — most resort ranges choose nylon, most training programmes choose polyester.

Do you supply swim lining?

Yes. We can quote a matching lining with the shell so opacity is solved at development rather than after the first fitting.

Send the swim programme, not just the style

Tell us whether the suit is for pool training, competition training or resort — the fabric route changes completely, and choosing the wrong one shows up in month two.

Request swatches & pricing