Under Armour Men's Ua HeatGear Exo S/S Compression Shirt Machine Wash Compression - Ultra tight, second skin feel. Heat Gear Fabric - Mesh fabric allows ventilation throughout the t-shirt. 4-way Stretch Fabrication - Allows greater mobility in any direction. Moisture Transport System - Wicks sweat away and dries fast. Anti-Odour Technology - Prevents the growth of odour causing microbes.