Speedo Men's Must Be It Brief Swimsuit 78% Nylon, 22% Spandex Imported Made with 78% Econyl, a nylon fabric made from 100% regenerated nylon from pre and post-consumer waste. Retains its shape up to 10X longer than traditional swimwear fabrics Offers 4X the compression of standard fabrics and is twice as strong 30 percent more resistant to fiber breakage in chlorine compared to power flex Good for the environment, even better for swimmers