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. * Built for motion: Hem gripper around the waist, stretch airflow mesh under the arms, and taped and bonded sleeves ensure maximum comfort and support in any activity. * Cold machine wash, gentle cycle, with like colors. Do not bleach, iron, or tumble dry.