Giro's Chrono Knee Warmers' clean design moves freely with you. They are constructed with Wikpro material, a proprietary blend of polyester and nylon knit that enhances moisture transfer while staying soft against the skin and providing great rebound and fit. These knee warmers have enough stretch to allow freedom of movement, while staying comfortably in place on your body. Keep your knees covered to extend your ride even when the weather gets brisk.