Under Armour Men's ColdGear Infrared Tech 1/4 Zip Sweatshirt Constructed of 100% polyester UA Tech Fleece fabric. UA Tech Fleece fabric uses a textured interior, providing unrivaled warmth for the weight. ColdGear Infrared uses a soft, thermo-conductive inner coating to absorb and retain your own body heat. Signature Moisture Transport System wicks sweat away from the body. Ribbed cuffs, collar, and hem.