Salomon Men's EXO CALF LONG Support for Improved Muscle Support and Blood Flow, Perfect for Calf & Sleeves 100% Other Fibers Imported Long trail runs shake muscles and increase fatigue, but exo technology comfortably supports muscles to help reduce fatigue and improve endurance. Keep those calves warm in any weather with the stretch comfort of lycra. Wear them a few times between Washings, then throw them in the machine. Body: Pa 78%/El 22% Overlay: Pu 100%