Compression: Ultra-tight, second-skin fit Pulls heat away from you - UA CoolSwitch uses an exclusive coating Ultra-durable and ventilation - Breathable ArmourVent™ mesh back panel Great mobility in any direction - 4-way stretch fabrication Fabric wicks away sweat and dries fast - Moisture Transport System Anti-odour technology Smooth, chafe-free flatlock seam construction Oferring an ultra-tight, compression fit, Under Armour's SuperVent Armour Short Sleeve Shirt features UA CoolSwitch. Using an exclusive coating on the inside that pulls heat away from your skin, UA Coolswitch makes you feel cooler.