Eco-friendly swimwear is made from premium recycled ocean plastics, such as Econyl (recycled nylon from discarded fishing nets) or Repreve (recycled plastic bottles). These sustainable materials are not only eco-conscious but also superior in quality—offering chlorine resistance, UPF 50+ UV protection, and enhanced shape retention compared to virgin nylon.
1.The Overlooked Ocean Killer: The “Plastic Debt” of Fast-Fashion Swimwear
While many people are aware that plastic bags and straws endanger sea turtles, few realize that 34% of the 19 million tons of plastic entering our oceans annually comes from textile microplastics. That swimsuit languishing in your closet—worn only twice before losing its shape—is a major contributor to this crisis.
Over 90% of conventional swimwear is made from synthetic fibers like nylon and polyester. Firstly, every machine wash releases hundreds of thousands of microscopic plastic fibers into waterways. These particles eventually reach the ocean, where they are ingested by plankton and travel up the food chain—ultimately back to our own dinner plates. Secondly, fast-fashion swimwear is designed for disposability, often marketed as “single-season wear.” Priced at just tens of dollars, these garments rarely survive two summers. When discarded, they take up to 400 years to decompose in landfills; if they enter the ocean, they entangle marine life or break down into ever-smaller plastic particles.
The irony is biting: Many fast-fashion brands launch “Ocean Collection” swim lines that merely print marine motifs onto synthetic fabrics. Without utilizing recycled plastics or addressing microplastic pollution, these collections are nothing but “greenwashing”—a marketing ploy disguised as environmentalism.
2.Decoding the Tech: What Exactly Are ECONYL® and REPREVE®?
Fortunately, fabrics capable of truly “digesting” plastic waste now exist. Among them, ECONYL® and REPREVE® stand out as the most mature and widely adopted solutions, shattering the stereotype that “eco-friendly equals poor quality.”
- ECONYL®: Regenerated Nylon “Reclaimed” from Ocean Waste
This patented technology, developed by Italian yarn producer Aquafil, sources its raw materials primarily from three streams: discarded fishing nets from deep seas, industrial plastic waste, and used carpets.
After collection, the waste undergoes cleaning and sorting, followed by chemical depolymerization to revert it into nylon 6 feedstock. Finally, it is respun into regenerated yarn that matches the performance of virgin nylon 100%.
Its environmental benefits are clear-cut: producing one ton of ECONYL® saves 70,000 barrels of crude oil and cuts CO₂ emissions by 57.7 tons—equivalent to planting 2,000 trees. Brands like Patagonia and Outerknown now widely use it for swimwear and wetsuits, where its elasticity, chlorine resistance, and abrasion durability match—or even surpass—virgin nylon.
- REPREVE®: American Tech Turning Plastic Bottles into Swimwear
Developed by U.S.-based Unifi, REPREVE® is a recycled polyester fiber. Roughly 80% of its raw material comes from recycled plastic bottles, with the remaining 20% sourced from textile waste and ocean plastics.
To date, REPREVE® has “recycled” over 35 billion plastic bottles. The energy saved could power an average American household for more than 300,000 years. Swimwear made with REPREVE® offers enhanced UV protection and faster drying times. Many affordable eco-brands choose it for their entry-level sustainable swimwear lines.
- Key Takeaway: Both materials are infinitely recyclable. Even when a swimsuit wears out, it can be reclaimed and spun into new fabric—unlike conventional synthetics, which deplete resources and accumulate pollution with every use.
3.Tips for Avoiding Greenwashing When Buying Eco-Friendly Swimwear
The market is flooded with “fake eco-friendly” swimwear. Here are three ways to tell the real from the fake:
- Check the certifications: Look for official labels like ECONYL® or REPREVE® on the hangtag—not just the brand’s own “eco” or “recycled” stickers.
- Read the fine print: Prioritize suits made with 100% recycled fibers. Be wary of “greenwashed” products that contain only token amounts of recycled material (like 5%)—such minimal content makes virtually no difference to the environment.
- Know the brands: Steer clear of “eco-limited editions” from fast-fashion labels. These are often little more than marketing gimmicks, with quality still stuck in the disposable fast-fashion cycle—swimwear that falls apart after a few wears ends up being even more wasteful.
