Made of 63% nylon, 23% polyester and 14% elastane, this mock has a compression (tight) fit, features the Under Armour moisture transport system which wicks moisture away from the body to keep you warm and dry. It also has the Armour block which neutralizes odors for the life of the garment. Ideal for temps under 55*. Machine wash cold, no bleach, iron, or softeners. Imported.