Under Armour Men's Raid Turbo Short Sleeve T-Shirt 100% Polyester Imported UA Microthread technology in the fabric dries faster, wont cling to you, wont chafe & stretches without absorbing sweat HeatGear fabric is ultra-soft & smooth for extreme comfort with very little weight Stretch-mesh back panel delivers strategic ventilation 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat & dries fast