Skins Men's A400 Long Tights Nylon 76% / Spandex 24% Imported 76% Nylon, 24% Spandex More oxygen to your muscles. World's first Dynamic Gradient Compression delivers more oxygen-filled blood to active muscles, increasing endurance, power, and efficiency. Specifically placed Memory MX panels offer maximum support to key muscle groups and help reduce IT Band Friction Syndrome (ITBFS). Cold machine wash, gentle cycle, with like colors. Do not bleach, iron, or tumble dry.