Under Armor Tac Mock Black Large Men's Base, (001)/Black,

ColdGear Reactor is an intelligent insulation that adapts to your activity level, providing just the right amount of breathability and warmth. The fabric is soft and has brushed "nodes" that are close to the skin, allowing for breathability while you move. Sweat-absorbing and quick-drying material. Anti-odor technology prevents the growth of bacteria that cause odor. Mock neck construction provides enhanced coverage.