UA Base 4.0 Extreme Baselayer is our warmest yet, delivering extreme warmth in the extreme cold
Soft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortable
4-way stretch material moves better in every direction
Description
Under Armour's mission is simple: to make you better. That means if you set a goal, we'll help you crush it. We do that with performance innovation and game-changing shoes, shirts, and digital tools that push the limits of what you thought possible.
