Washing Tip : Wash separately before wearing. It is suitable for indoor and outdoor activities such as football, basketball, hiking, cycling, boxing, fitness, gym, training. [2-way Air Circulation] Multi-layer blocks out the cold while preventing heat loss from the body. [Materials] Mix of Polyester & Spandex fabric is excellent elasticity with enhanced range of motion. ATHLIO Thermal Baselayer Series designed for warmth. *Alert: True to size : Please follow the size examples below*(EX: Size "Large recommended" - Size for 6" 215 lbs.) (EX: Size "Medium" 5'9"165 lbs.). Machine Wash. elastic closure. Polyester, Spandex.