Lameda Men's Workout Running Athletic Compression Tank Tops Sleeveless Shirts Skin Tights Cool Dry Base Layer polyester Excellent Elasticity, good polyester spandex material ,can enhanced range of motion. Powerful & Lightweight , provide unrestricted freedom. Quick Dry fabric ,wicks sweat away from the body, keep you cool and dry. Smooth & Soft fabric, flat lock seams to reduce chafe, provides extreme comfort. Designed for all sports, such as training, baseball, basketball, soccer, cycle, yoga, indoor and outdoor activities.