Under Armour Coldgear Fitted MockDual layer fabric with an ultra warm, brushed interior & a smooth, fast drying exterior Stretch mesh back & underarm panels provide strategic ventilation without sacrificing warmth 4 way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti odor technology prevents the growth of odor causing microbes Ergonomic design keeps seams off of high abrasion areas Mock neck construction for added coverage & warmth