How to Tell Quality Swimwear Fabric from the Rest: A Buyer's Checklist
With so many swimwear options on the market, how do you know you're investing in quality? The difference between a swimsuit that lasts one season and one that lasts five often comes down to fabric. Here's a practical checklist to help you identify premium swimwear fabric before you buy.
1. Check the Fabric Composition
Look for a high nylon content — ideally 80% or above — combined with spandex or elastane for stretch and recovery. Nylon outperforms polyester in every key area: it resists chlorine and saltwater degradation, retains its shape wash after wash, and feels softer against the skin. Avoid 100% polyester swimwear — it lacks the recovery, comfort, and longevity of nylon-spandex blends.
2. Test the Stretch & Recovery
Gently stretch the fabric and release. Quality fabric — particularly four-way stretch nylon-spandex — snaps back immediately with no sagging or distortion. Four-way stretch means the fabric stretches both horizontally and vertically, allowing it to move with your body in every direction. If the fabric stays stretched or takes time to recover, the elastane content is too low and the piece will lose its shape quickly.
3. Look at the Stitching
Premium swimwear uses flatlock or overlock stitching that lies flat against the skin — no rough edges, no raised seams. Rough, raised, or uneven seams are a sign of lower construction quality and will cause discomfort during wear.
4. Examine the Hardware
Gold or silver hardware should feel solid and weighty — not hollow or flimsy. Quality hardware is selected for both aesthetics and resistance to salt and chlorine. Franco Marine uses premium gold-tone hardware on all pieces, chosen to maintain its finish through repeated exposure to seawater and sun.
5. Check for Lining
All quality swimwear should be fully lined. Unlined swimwear becomes see-through when wet and offers no support or modesty. A double-lined gusset is the minimum standard for any swimwear bottom.
6. Feel the Weight and Density
Premium nylon-spandex has a satisfying weight and density — it feels substantial in the hand. Thin, papery, or translucent fabric is a red flag regardless of how it looks on the hanger. Heavier fabric generally indicates a higher nylon content and better construction.
Why Fabric Matters More Than Price
A higher price tag does not always guarantee quality fabric — and a lower price does not always mean poor quality. The checklist above gives you the tools to evaluate any swimwear piece on its actual merits. That said, truly premium nylon-spandex, hand-finished hardware, and flatlock stitching do carry a cost — which is why luxury swimwear from brands like Franco Marine is priced to reflect the materials and craftsmanship involved, not just the label.
Investing in quality swimwear fabric means fewer replacements, better fit over time, and a piece that looks as good at the end of the season as it did at the beginning.
Shop with Confidence
Every Franco Marine piece meets these standards. Explore our tops, bottoms, and signature collections including Viva la Vida and Montferrat.
Frequently Asked Questions
What is the best fabric for swimwear?
The best fabric for swimwear is a premium nylon-spandex blend — typically 80% nylon and 20% spandex or elastane. Nylon provides durability, chlorine resistance, and a soft feel, while spandex delivers the four-way stretch and shape recovery that keeps swimwear fitting correctly over time.
Is nylon or polyester better for swimwear?
Nylon is generally better than polyester for swimwear. Nylon is softer, more resistant to chlorine and saltwater degradation, and retains its shape and colour more effectively over time. Polyester is more affordable but tends to feel rougher and loses elasticity faster with repeated use.
How long should quality swimwear last?
Quality swimwear made from premium nylon-spandex should last three to five seasons with proper care — rinsing in cold water after each use, hand washing with mild detergent, and laying flat to dry. Swimwear that loses its shape, fades, or pills after one season is typically made from lower-grade fabric.
What percentage of spandex is best in swimwear?
A spandex content of 15–20% is ideal for swimwear. This range provides excellent four-way stretch and shape recovery without compromising the durability and structure that nylon provides. Swimwear with less than 10% spandex will have limited stretch and poor recovery.
Does swimwear fabric affect fit?
Yes — significantly. High-stretch nylon-spandex expands to conform to your body shape, creating a smooth, second-skin fit. Lower-stretch fabrics may feel stiff, gap at the cups or waistband, and fail to provide the sculpting and support that premium swimwear is designed to deliver. This is why Franco Marine recommends sizing down — the high-stretch fabric expands to fit perfectly when worn.