Best Sporty Sustainable Swimwear: Nike Sportswear giant Nike isn't the most sustainable option in this roundup, we know. But it is one of the bigger retailers who can really make a difference en masse when actively making positive changes. The Nike Colour Block Women's Crossover One-Piece (£44.95) is made from at least 75 percent recycled polyester, which is more environmentally friendly than virgin polyester found in some of its other swim products. Image Source: nike.com Nike Colour Block Women's Crossover One-Piece £44.95 from nike.com Buy Now