Constructed with TYR’s most durable textile, Durafast Elite® this swimsuit utilizes high denier poly fiber and innovative circular knit construction to combine the strength and colorfastness of polyester with the comfort of spandex. The Racer is a compressive brief style that offers great support and comfort TYR Swimsuits are lined and are Chlorine Resistant. TYR Durafast Elite: 94% Polyester, 6% Spandex.