Made of TYR's most durable and flexible textile possible, Durafast Elite, this swimsuit brief utilizes high denier poly fiber and innovative circular knit construction, to combine the strength and colorfastness of polyester with the comfort of spandex. Offering reduced coverage on the legs and a compressive fit for reduced drag, the Durafast Elite Square Leg is able to sustain 300+ hours of use while maintaining a comfortable hold on your body and is 100% chlorine proof. TYR Construction: 94% Polyester / 6% Spandex