“Eco-friendly”, “sustainable”, “conscious”, “made from ocean plastic”: swimwear labels are full of green promises. Some of them describe real, meaningful choices. Others are vague enough to mean very little. If you want to buy swimwear with a lower environmental impact, it helps to know which claims you can check and which questions to ask.
This guide explains what sustainable swimwear usually means, the materials and certifications to look for, the trade-offs nobody mentions on the hang tag, and why the most sustainable swimsuit is often the one you already own.
Quick takeaways
- Almost all swimwear is made from synthetic fibres. “Sustainable” usually means recycled synthetics, not natural fabrics.
- Recycled nylon and polyester perform much like conventional versions and reduce the need for new raw materials.
- Specific, checkable claims (percentages, named certifications) are more meaningful than vague words like “eco” or “green”.
- Durability matters: a well-made suit you wear for years is often the lowest-impact choice.
- Caring for your swimwear properly and buying less, but better, makes a real difference.
Why swimwear is tricky to make sustainable
Swimwear has demanding requirements. It needs to stretch and recover, hold its shape when wet, resist chlorine, salt and sun, dry quickly and keep its colour. Those properties come from synthetic fibres, mainly nylon or polyester, blended with elastane (spandex).
Natural fibres like cotton absorb water, sag and dry slowly, so they aren’t practical for most swimwear. That means the sustainable swimwear conversation is mostly about making synthetic swimwear better: using recycled fibres, reducing waste and chemicals, and making suits that last. For a closer look at how each fibre behaves, see our swimwear fabrics guide.
What “eco-friendly” swimwear usually means
When a brand describes swimwear as sustainable, it generally refers to one or more of the following.
Recycled nylon
Recycled nylon is made by collecting nylon waste, such as factory offcuts, old carpets and discarded fishing nets, breaking it down and turning it back into new yarn. Once processed, it performs very much like conventional nylon: soft, stretchy and smooth.
The “made from fishing nets” or “ocean plastic” story is appealing, and in many cases it’s genuinely part of the supply chain. But the recycled content can also come from other waste sources, and the percentage varies. Look for the actual recycled content on the label.
Recycled polyester
Recycled polyester is usually made from plastic bottles or other polyester waste. It’s a widely available alternative to virgin polyester and holds up well in chlorine and sun, making it a good choice for pool swimmers.
What about the elastane?
Most sustainable swimwear still uses conventional elastane for stretch, because recycled or lower-impact alternatives are far less common. So even a suit marketed as “recycled” is usually a blend of recycled base fibre and new elastane. That’s normal, but it’s worth knowing when you read a label that says “made from recycled materials”.
Other claims you might see
- Low-impact or non-toxic dyes: dyeing processes that aim to use less water, energy or harmful chemicals. This is harder for shoppers to verify without a certification.
- Plastic-free packaging: shipping in paper or compostable materials.
- Made to order or small batches: producing in smaller quantities to reduce unsold stock.
- Ethical manufacturing: commitments to fair wages and safe working conditions, ideally backed by audits or published supplier information.
- Take-back or recycling programmes: some brands accept old swimwear for recycling or resale.
How to tell a real claim from greenwashing
Greenwashing is when a product is marketed as more environmentally friendly than it really is. With swimwear, the difference between a meaningful claim and a vague one often comes down to specifics.
| Vague claim | More meaningful version |
|---|---|
| “Eco-friendly fabric” | “78% recycled nylon, 22% elastane” |
| “Made from ocean plastic” | A stated recycled content percentage, ideally with certification |
| “Non-toxic” | Certified to a named textile safety standard |
| “Ethically made” | Named factories, published audits or supplier lists |
| “Sustainable brand” | Clear information on materials, production and care |
A few questions to ask when you’re reading a product page:
- What percentage of the fabric is recycled, and what’s the rest?
- Does the claim apply to the outer fabric, the lining, or both?
- Is there an independent certification, or is it just the brand’s own description?
- Does the brand explain where and how the swimsuit is made?
Certifications worth knowing
Certifications don’t tell you everything, but they add a layer of independent checking. These are some of the most common in swimwear:
- Global Recycled Standard (GRS): verifies recycled content and tracks it through the supply chain, and includes some social and environmental criteria for production.
- Recycled Claim Standard (RCS): verifies recycled content in a product.
- OEKO-TEX Standard 100: indicates that a textile has been tested for a list of harmful substances.
- bluesign: focuses on chemicals, resources and safety in textile production.
If a brand mentions a certification, it’s worth checking whether it applies to the specific product or just to the fabric supplier or a single part of the range.
Pro tip: A certification logo on a brand’s homepage doesn’t necessarily mean every product is certified. Check the individual product page or ask customer service which items the certification covers.
The trade-offs nobody mentions
Sustainable swimwear is a real step forward, but it’s not a perfect solution. Knowing the limitations helps you make balanced choices.
Microfibres
Synthetic fabrics, recycled or not, can shed tiny fibres during washing and wear. Hand washing in cool water, avoiding harsh wash cycles and washing less often (rinsing instead) can help reduce shedding. Some people use a laundry bag designed to capture microfibres when machine washing synthetics.
Recycling at end of life
Swimwear blends are difficult to recycle because separating nylon or polyester from elastane is complex. That means a swimsuit made from recycled material doesn’t automatically get recycled again. Take-back schemes are growing, but they aren’t universal.
Durability varies
A sustainably made swimsuit that loses its shape after one season isn’t a great environmental outcome. Look for good construction: solid stitching, full lining, quality elastic and fabric that feels substantial rather than thin.
The most sustainable swimsuit is the one that lasts
Whatever a swimsuit is made from, the biggest single lever you control is how long you wear it. A few ways to make that happen:
- Buy for fit, not just for trend. A swimsuit that fits well gets worn. Our guide on measuring for a swimsuit helps you get your size right online.
- Choose versatile styles and colours. Pieces you can mix and match stay in your rotation longer.
- Care for it properly. Rinsing after every wear, hand washing and drying flat in the shade all extend a swimsuit’s life. Our guide on how to care for swimwear covers every step.
- Buy separates. Buying tops and bottoms separately means you can replace one piece without buying a whole new set.
- Repair small issues. Loose stitching or a detached tie can often be fixed at home or by a tailor.
What to do with old swimwear
When a swimsuit has genuinely reached the end of its life, there are still options:
- Check whether the brand, or a local retailer, runs a take-back programme.
- Look for textile recycling points that accept synthetic fabrics.
- Repurpose it: old swimsuits can become cleaning cloths, or be kept for hot tubs, swim lessons or water sports where wear and tear doesn’t matter.
- Donate or resell swimwear that’s still in good condition, where local rules and hygiene guidelines allow.
FAQ
Is recycled swimwear as good as regular swimwear?
Recycled nylon and polyester generally perform very similarly to their conventional versions in stretch, feel and durability. The quality of construction and the fabric blend matter more than whether the fibre is recycled.
Are natural-fibre swimsuits more sustainable?
Natural fibres like cotton aren’t practical for most swimwear because they absorb water, sag and dry slowly. Some brands use blends with small amounts of plant-based fibres, but most swimwear relies on synthetics for performance.
How can I spot greenwashing in swimwear?
Watch for vague words without specifics. Meaningful claims usually include percentages, named certifications and clear information about where and how the product was made.
Is sustainable swimwear more expensive?
It often costs more than fast-fashion swimwear, partly because of recycled materials, smaller production runs and certification costs. A well-made swimsuit that lasts several seasons can work out as a better investment over time.
Choosing better, not perfect
You don’t need to get every detail right to make a better choice. Look for specific, checkable claims, pick a swimsuit you’ll love wearing for years, and take good care of it. Those simple steps add up to a swimwear wardrobe with a smaller footprint.
