A performance fabric, Supplex offers superior moisture wicking over cotton, dries quickly, and is antibacterial. The fabric is stronger than cotton providing support and durability, but maintains a lightweight feel while working out. "Black Lycra" on the under layer of the fabric; normally the under layer of lycra fiber is white, so the result is when you're stretching in a forward bend your backside won't look shiny with that "white" effect. The effect is more matte than a typical cotton/lycra blend. As with all Hardtail fabrics, this pant offers four-way stretch. 90% Supplex, 10% Lycra.