The Under Armour Men's ColdGear Fitted Mock combine lightweight comfort, breathable performance, and easy mobility in a streamlined athletic design. We all hate it. That stiff, distracted feeling you get when you're out in the cold. That's why, we built a baselayer that keeps you warm and dry without being bulky or riding up, so you can stay focused all season long. Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior Material composition includes 87% Polyester/13% Elastane. Notable features include Stretch-mesh back & underarm panels provide strategic ventilation without sacrificing warmth; 4-way stretch material moves better in every direction; Material wicks sweat & dries really fast.