Under Armour Coldgear Infrared Grid Crew Long Sleeve Top Dual-Layer, Textured-Grid Fabric - Traps heat for unrivalled warmth with very little weight. ColdGear Infrared - Uses a soft, thermo-conductive inner coating to absorb and retain your own body heat. Moisture Transport System - Wicks sweat away from the body. Anti-Odour Technology - Prevents the growth of odour-causing microbes. Dart Shoulders - For superior fit.