Under Armour ColdGear Infrared 1/2 Zip Long Sleeve Running Top ColdGear Infrared Technology - Employs a soft, thermo-conductive inner coating to retain heat close to the body and provide comfortable, consistent insulation for the wearer. Ventilated Mesh Rear - Regulates the wearer's temperature across critical heat zones. Moisture Transport System - Wicks sweat away from the skin and onto the garment's surface, from which it evaporates, to encourage a cooler, drier, fresher environment. Anti-Odour Technology - Quells the spread of odour carrying bacteria. Reflective Components - Maintain the wearer's visibility in poor light.