Skins running pants Bio Sport long tights black 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. Stay protected. Permanent antimicrobial treatment, microfiber moisture wicking, and UPF 50+ sun protection help you stay dry and comfortable, dry, and performing at peak temperature in any conditions. Cold machine wash, gentle cycle, with like colors. Do not bleach, iron, or tumble dry.