The Under Armour Game Day Compression Mock features signature UA compression fit for top performance. Update brushback knit fabrication traps heat for enhanced warmth. Flatlock seams and raglan sleeve construction provides increased comfort and mobility. Ergonomic neck design to keep more of your neck covered for added warmth. Silicone gripper at the hem helps keep your shirt from riding up and letting cold air in. Superior moisture transport keeps you dry and comfortable. ColdGearŽ 87% polyester/13% spandex. Imported.