The Durafast Elite Solid Jammer features Durafast Elite, TYR's most advance performance and training fabric. With a 94-Percent polyester 6-Percent spandex blend the strength and colorfastness of polyester are combined with the comfort of spandex. Durafast Elite is able to sustain 300+ hours of use while maintaining a comfortable hold on your body. This jammer showcases full coverage, a compressive fit, freedom of movement and drag reduction.