The warmest baselayer Under Armour makes is the Under Armour Base 4.0 Crew Top. For those extra cold days sitting in the treestand in the middle of winter this 4.0 baselayer system is the only way to keep you comfortably warm and mobile at the same time.
- UA Base™ 4.0 delivers heat like no other, keeping you warm even in the brutal cold
- Soft, brushed negative grid interior traps hot air, providing superior warmth
- 4-way stretch fabrication allows greater mobility in any direction
- Moisture Transport System wicks sweat away from the body
- Anti-Odor technology prevents the growth of odor causing microbes