Durable, Moisture-Wicking Fabric: Constructed of 85% microfiber performance polyester and 15% spandex, these thermal shirts for men also feature Intellifresh(tm) odor-control on the fabric technology powered by Silvadur(tm) Athletic Fit: The perfect long-sleeve workout shirts for men, our men’s thermals feature an extended body and sleeves, a tagless design, and flat seams for a smooth, ultra-comfortable fit Efficient Design: Long-sleeve undershirt for men features a crew neckline and hemmed cuffs with thumbholes for easy layering; Drop tail maintains coverage without restricting freedom of motion Comfortable Base Layer: Our men’s thermal underwear top is engineered with a single layer that wicks away moisture to help keep you dry and comfortable Multipurpose Apparel: Our men’s base layer crew neck top allows for minimal layering in any weather condition or activity level; Perfect for casual or active wear