The Under Armour Base 3.0 Long-Sleeve Crew Shirt delivers aggressive warmth even in extreme cold conditions. Rugged 92% polyester, 8% elastane ColdGear fabric dries quickly to keep you drier, lighter, and more comfortable than ever before. An ArmourBlock antimicrobial treatment helps reduce odors, ensuring that you stay fresher longer. The thermal grid interior traps heat in tiny pockets for long-lasting warmth. Lightweight, four-way stretch construction offers improved mobility and maintains its shape. Ergonomic flatlock seams help reduce chafing and allow for easy layering. This essential baselayer top features a classic crew-neck collar, raglan sleeve design, thumbholes at the cuffs, and a slight drop-tail hem for added coverage in back. Fitted design. Imported.