Swimwear Fabric Types Explained: From Nylon to Recycled Materials
The main swimwear fabric types you’ll encounter as a buyer are nylon-spandex blends, polyester blends, and recycled alternatives — and honestly, the fabric you pick matters more than most people think. I’ve been on the manufacturing side for over 12 years, and I’ve seen firsthand how a single fabric decision can make or break a product line. This guide covers what each material actually does in real-world use, not just what the label says.
Nylon-Spandex: The Industry Standard for a Reason
When someone says “swimsuit fabric,” 8 times out of 10 they’re talking about a nylon-spandex blend. The typical ratio we run in our factory is 80% nylon / 20% spandex, though some performance pieces go up to 85/15 for a slightly firmer feel.
Nylon is soft against the skin, dries reasonably fast, and takes color well during dyeing. Spandex (or elastane, same thing) provides the stretch and recovery that makes swimwear actually fit. Without it, you’re basically wearing a wet sack.
Here’s something most sourcing guides won’t tell you: not all nylon is equal. The 6,6 nylon we source from our regular suppliers in Taiwan has a tensile strength about 15% higher than standard 6 nylon, and it holds up noticeably better after 50+ wash cycles. We tested this internally in Q3 2025 — the 6,6 batches showed less than 3% dimensional change versus 8-10% on the standard grade.
If you’re sourcing swimwear fabric types for a mid-range to premium line, nylon-spandex is your safest bet. It works for one-pieces, bikinis, rash guards — pretty much everything. The main downside? It’s not great in chlorine. More on that later.
Polyester Blends: Budget-Friendly but with Trade-Offs
Polyester-spandex blends (usually 82/18) are the go-to for value-oriented swimwear. The fabric costs roughly 20-25% less per yard than nylon equivalent, and it’s more colorfast — meaning prints hold their vibrancy longer under UV exposure.
I don’t want to trash polyester. It has legitimate uses. If you’re producing promotional swimwear, resort giveaways, or entry-level retail where price per unit is the driving factor, polyester gets the job done. We’ve done runs of 10,000+ units for promotional clients where polyester was absolutely the right call.
But here’s where it falls short: hand feel. Polyester has a slightly rougher, less silky texture compared to nylon. It also doesn’t stretch and recover quite as smoothly. Consumers who’ve worn both can usually tell the difference, especially in form-fitting styles like competition swimsuits or high-end bikinis.
Chlorine-Resistant Fabrics: PBT and Polyester for Pool Use
This is a category a lot of buyers overlook until their returns start piling up. Standard nylon-spandex degrades in chlorinated water — we’re talking visible pilling, loss of elasticity, and color fading after 30-40 pool sessions. For swim schools, training programs, and water aerobics, that’s a dealbreaker.
PBT (polybutylene terephthalate) is the answer most factories reach for. It’s a polyester variant that resists chlorine at a molecular level. PBT fabrics typically maintain 95%+ of their elasticity after 200+ hours of pool exposure. The trade-off is that PBT is stiffer and less stretchy out of the box — it doesn’t have that “second skin” feeling.
We also see increasing demand for 100% polyester chlorine-resistant knits with a special finish. These sit between PBT and standard polyester in terms of feel, and they’ve become our fastest-growing fabric category for B2B buyers in the training swimwear space. If you’re targeting swimming schools or fitness centers, this is worth serious consideration.
Recycled Materials: ECONYL, Repreve, and What’s Real
Recycled swimwear fabrics have gone from a marketing gimmick to a legitimate product category. The two names you’ll see most are ECONYL (by Aquafil, made from fishing nets and industrial waste) and Repreve (by Unifi, from post-consumer PET bottles).
From a manufacturing perspective, recycled nylon performs almost identically to virgin nylon in terms of stretch, recovery, and hand feel. We’ve been using ECONYL since 2024, and our in-house testing shows less than 2% performance difference versus our standard 6,6 nylon across stretch recovery, pilling resistance, and color fastness.
The cost premium is real though. Recycled nylon currently runs about 15-20% above virgin nylon per yard. For wholesale buyers, this means either absorbing the cost for a premium positioning or passing it to the end consumer. What we’ve seen work well is a “conscious collection” strategy — offering 2-3 SKUs in recycled fabric alongside the main line, priced 10-15% higher, with sustainability messaging that justifies the premium.
If you’re evaluating recycled fabrics for your next collection, I’d suggest ordering swimwear samples in both virgin and recycled versions of the same style. Feel them side by side, run them through your own stretch tests. The data matters, but so does the tactile experience your customers will have.
Quick Comparison: Choosing the Right Fabric for Your Market
| Fabric Type | Cost/Yard (approx.) | Chlorine Resistance | Hand Feel | Best For |
|---|---|---|---|---|
| Nylon/Spandex (80/20) | $3.50-$5.00 | Low | Excellent | Fashion swimwear, beachwear |
| Polyester/Spandex (82/18) | $2.50-$3.80 | Medium | Good | Promotional, value retail |
| PBT | $4.00-$6.00 | High | Fair | Training, swim schools |
| Recycled Nylon (ECONYL) | $4.50-$6.50 | Low | Excellent | Premium eco-conscious lines |
Frequently Asked Questions
What is the most durable swimwear fabric?
PBT and chlorine-resistant polyester offer the longest usable life in pool environments. For ocean and beach use, nylon-spandex with a quality finish typically lasts 2-3 seasons with normal care.
Is recycled swimwear fabric as good as regular nylon?
In our factory testing, ECONYL recycled nylon shows less than 2% performance difference versus virgin 6,6 nylon. The hand feel, stretch recovery, and color fastness are nearly identical.
What fabric is best for competitive swimwear?
Competitive swimwear typically uses specialized polyester or PBT blends for chlorine resistance, sometimes with compression technology woven in. Check out our competitive swimwear wholesale options for technical specs.
Ready to source the right fabric for your swimwear line? Get in touch with our manufacturing team — we can send fabric swatches and sample suits so you can feel the difference before committing to a production run.