The Under Armour Base 4.0 Long-Sleeve Crew Shirt delivers heat like no other, keeping you warm even in the brutal cold. Rugged 92% polyester, 8% elastane ColdGear fabric is treated with an ArmourBlock antimicrobial finish to help reduce odors, ensuring that you stay fresher longer. The soft, brushed negative grid interior traps hot air to provide exceptional warmth. Four-way stretch fabrication offers increased freedom of movement and maintains its shape. The Signature Moisture Transport System wicks sweat away from the body to keep you comfortably dry. Ergonomic flatlock seams help reduce chafing and allow for easy layering. This essential baselayer top features a classic crew-neck collar, raglan sleeve construction, and a slight drop-tail hem for added coverage in back. Fitted design. Imported.