Fabric: Our sleeves are made of Polyester. Anti slip: With silicone anti slip straps, they can help the calf sleeves secure well on your legs no matter what you do. Sweat Absorption: Moisture wicking fabric is fresh and breathable, absorbs and diffuses sweat. It keeps your calves drier when you sweat. Special design: Anti-collision, elastic wrapping, anti-collision and anti drop, protecting the calves. Extensive Applications: Ideal for a variety of sporting activities including: running, cycling, soccer, rugby, tennis, basketball, weightlifting and general fitness.