TYR Men's Durafast Elite Solid Racer Swimsuit Made of TYR’s most durable and flexible textile possible, Durafast Elite, the RDUS7A utilizes high denier poly fiber and innovative circular knit construction, to combine the strength and colorfastness of polyester with the comfort of spandex. 92% Polyester / 8% Spandex (Fully Lined Black)