Under Armour Women's Base 3.0 Crew Long Sleeve 92% Polyester/8% Elastane Imported UA Base 3.0: Aggressive warmth for extreme cold Thermal grid fabric traps heat in tiny pockets for long-lasting protection Quick-dry construction wicks moisture to keep you drier, lighter & more comfortable 4-way stretch construction moves better in every direction Anti-odor technology prevents the growth of odor-causing microbes