Men's Under Armour Base 2.0 Crew Top, BLACK, XL ColdGear UA Base 2.0 is highly versatile mid-weight protection for colder conditions and a variety of activity levels Lightweight 4-Way Stretch fabrication improves range of motion and dries faster Signature Moisture Transport System keeps you warm, dry, and comfortable Anti-Odor technology prevents the growth of odor-causing microbes to keep your clothes fresher, longer Raglan sleeve construction and Flatlock Seams deliver total mobility and full range of motion while eliminating chafing