Made of TYR's most durable and flexible textile possible, Durafast Elite® - tthe RDUS7A utilizes high denier poly fiber and innovative circular knit construction, to combine the strength and colorfastness of polyester with the comfort of spandex. Offering minimized coverage and a compressive fit for reduced drag, the Durafast Elite Brief can sustain 300+ hours of use while maintaining a comfortable hold on your body and is 100% chlorine-proof.