ColdGear is the ideal base layer for cold conditions (less than 45 degrees Fahrenheit). It delivers core temperature regualtion and moisture transport via a two-layer fabrication: the soft, brushed inner layer helps lock in heat and repell moisture to the outer layer, where evaporation takes over. Brushed ColdGear fabrication combines loft and thermal temperature regulation to maximize comfort and performance in extreme cold weather conditions. The Under Armour Tactical Crew provides warmth without the weight. It is available in sizes small to XXX-large and colors white, black, Midnight Navy, olive and army.