Under Armour Men's Base 4.0 Crew 92% Polyester/8% Elastane Imported UA Base 4.0 delivers heat like no other, keeping you warm even in the brutal cold Soft, brushed negative grid interior traps hot air, providing superior warmth 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