Under Armour Vanish Seamless 1/4 Zip - Fitted: Next-to-skin without the squeeze. - 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 - Built-in thumbholes help keep sleeves secure - Raglan sleeves - 52% Nylon/45% Polyester/3% Elastane