The Best Sustainable Swimwear Brands to Have on Your Radar in 2025 and Beyond

We've finally reached the point of the year when the summer holiday countdown is underway, meaning the following things are imminent: sandy toes, basket bags and an excellent holiday capsule wardrobe. And second to deciphering how to condense your favourite summer holiday outfits into flight-approved luggage comes the complex question of swimwear.

Between impenetrable size guidelines, bust support levels and fabric options, there's much to decipher when it comes to swimwear. Amongst the most frequent questions I get asked as a fashion editor are where to buy the best bikinis and swimsuits, which shapes suit which body types (the ones that make you feel the best) and the justification for the price disparity between what's on the market.

Above all things, I advise thinking small. Shopping small, that is. The past few years have graced us with myriad swimwear brands that focus on sustainability, from eco-conscious materials to slow and thoughtful releases; it's the very antithesis of fast fashion.

Since 2021, we've witnessed a rising interest in high-end, high-quality swimwear, spearheaded by brands like Hunza G. The brand's fuss-free crinkle swimwear set the benchmark for elevated styles that are often synonymous with sustainability. The customer mindset is shifting; people are investing more heavily in budget and brands, and are eager to learn about textiles and innovation within the industry.

So, what makes a swimwear brand sustainable? If you regularly read my content on Who What Wear UK, you may be aware of my love for independent brands and natural materials, but these fabrics have limitations. Swimwear fabrics are akin to those of most high-performance clothing: water-resistant, elasticated, fast-drying and functional, and there are a handful of fibres and resins that fit the criteria. More often than not, sustainable swimwear is made from one of three: Econyl (regenerated nylon, typically sourced from landfills and oceans), Repreve (a durable fibre made from recycled plastic bottles) or recycled synthetics, such as post-consumer recycled polyester.

On occasion, recycled materials may be melded with virgin textiles to maintain integrity and ensure durability. Particularly scrupulous brands will ensure the continuation of the sustainable process across manufacturing, with considered dyes, attachments and fastenings; and some have attained Recycled Claim Standard (RCS) and Global Recycled Standard (GRS) accreditations.

Investing in premium-quality brands which uphold values and work with transparent production is a refreshing approach to sustainable shopping that I favour. Shopping for sustainable swimwear often equates to condensed and limited stocks, which is another powerful tool when tackling overconsumption in the fashion industry.

If you're keen to refresh your arsenal with a sustainable swimwear pick, you won't be disappointed with what you find. In my experience, they're made to withstand plenty of wear and fleeting trends alike. Continue reading to discover 16 of my favourite sustainable swimwear brands. Each makes considered, contemporary pieces fashioned with forever in mind.

Shop the Best Sustainable Swimwear Brands:

1. Maygel Coronel