Under Armour Women's Base 2.0 Crew 95% Polyester/5% Elastane Imported UA Base 2.0: Versatile mid-weight layering for cold conditions 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