Skins Men's Ry400 Recovery Long Sleeve Top Nylon 76% / Spandex 24% Imported 76% Nylon, 24% Spandex World class comfort. 400 Series fit technology, specifically placed Memory MX panels, taped and bonded hems and sleeve openings come together in the most comfortable recovery garment ever created. Scientifically proven 400 Series Technology significantly increases delivery of oxygen-rich blood to recovering muscles and accelerates lactic acid removal, eliminating muscle soreness and fatigue after training. Cold machine wash, gentle cycle, with like colors. Do not bleach, iron, or tumble dry.