This isn't your grandpa's long underwear! The most versatile of the UA Base thermals, the Under Armour Base 2.0 Long-Sleeve Crew Shirt is perfect for cold-weather conditions as well as a variety of activity levels. Midweight 93% polyester, 7% elastane ColdGear fabric dries quickly to keep you light and comfortable. The soft, brushed negative grid interior traps hot air to provide superior warmth. Four-way stretch fabrication allows greater mobility and maintains its shape, while ArmourBlock anti-odor technology helps prevent the growth of odor-causing microbes. The Signature Moisture Transport System wicks sweat away from the body to keep you dry. Raglan sleeve construction provides a full range of motion in the arms for even greater comfort. Flatlock stitching and ergonomic seam placement help reduce chafing and allow for easy layering. Fitted design. Imported.