Under Armour Coolswitch Run T-Shirt - X Large - Yellow 4-way stretch fabrication - Allows greater mobility in any direction. Moisture Transport System - Wicks sweat and dries fast. Anti-Odour Technology - Prevents the growth of odour-causing microbes. UA CoolSwitch - pulls heat away from your skin, making you actually feel cool and able to perform longer. Material Composition - 185g Polyester/Elastane.