76% Nylon, 24% Spandex * Turbo charge your legs. Increased delivery of oxygen-rich blood gives you increased speed, power and endurance, while reducing the buildup of lactic acid. * Rock-solid base: Memory MX fabric maximizes muscle support and compression while engineered gradient compression delivers more oxygen-rich blood to calf muscles. * Cold machine wash, gentle cycle, with like colors. Do not bleach, iron, or tumble dry.