UA Microthread fabric dries faster, does not stick, does not chafe and is flexible without absorbing sweat. Strategic brushed fleece lining for more warmth where you need it without excess bulk. 4-Way Stretch technology allows free movement in every direction. The material wicks away sweat and dries very quickly. Jacquard panels for greater breathability. Neckline for more coverage and warmth with elastic band tightening for a secure fit. Built-in thumb holes help keep the sleeves in place.