The Men's Under Armour 2024 Base 4.0 Base Layer keeps you warm on the coldest days of winter. Made from soft, brushed fabric, this heavyweight base layer traps and retains body heat, while the 4-way stretch material allows mobility in every direction, making it great for ice fishing, hunting, or other cold-weather activities. With Under Armour fabric technologies, the Men's Under Armour Base 4.0 Base Layer wicks away sweat, dries quickly, and controls scent.