Men's ColdGear UA Base 3.0 Crew Tops by Under Armour 95% 7.0 oz PolyArmour / 5% Elastane. Imported Under Armour's UA BASE solution for maximum thermal protection in a relaxed fit crew. Ideal for maximum warmth in extreme cold or lower exertion activities. Lightweight ColdGear grid fabric is engineered to trap heat for maintaining core temperature and quick drying moisture transport.