Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior. Stretch-mesh back & underarm panels provide strategic ventilation without sacrificing warmth. 4-way stretch construction moves better in every direction. Material wicks sweat & dries really fast. Ergonomic design keeps seams off of high abrasion areas. Mock neck construction for added coverage & warmth. Dropped, shaped hem - Style #: 1366066. 87% Polyester/13% Elastane. Imported - Machine wash cold with like colors. Use only non-chlorine bleach when needed. Tumble dry low. Do not iron. Do not use softeners. Do not dry clean. Optimal shirt: The thermal shirt features a dual-layer fabric with an ultra-warm, brushed interior, smooth, fast-drying exterior and mock neck. Breathable warmth: With innovative stretch-mesh back and underarm panels, the compression shirt gives strategic ventilation without sacrificing warmth. Quick-drying: The running top draws sweat away from the body, dries quickly and allows maximal freedom of movement with its 4-way stretch system. Absolute comfort: Thanks to the ergonomic design, the mens winter thermals fit perfectly with seams kept away from high abrasion areas. Material and fit: The running top is fitted for a streamlined fit that's not too tight or too loose, and is made of 87% Polyester and 13% Elastane.