Under Armour Men's Threadborne Seamless Long Sleeve T-Shirt 51% Polyester/49% Nylon Imported Soft knit fabric with engineered mesh ventilation, mapped to the places you need it most Nearly sew-free construction to eliminate chafing 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes