Under Armour Men's Raid Long Sleeve T-Shirt 90% Polyester, 10% Elastane Imported HeatGear fabric is ultra-soft & smooth for extreme comfort with very little weight Stretch-mesh underarm & back panels deliver strategic ventilation 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat & dries fast Anti-odor technology prevents the growth of odor-causing microbes