UA Base 4.0 is built for extreme cold weather and lower activity. It uses a unique pattern that’s designed to trap heat without adding bulk. Think long underwear, revamped for today’s top athletes.
- UA Base™ 4.0 Extreme Baselayer is our warmest yet, delivering extreme warmth in the extreme cold
- UA Scent Control Technology to keep you undetected in all pursuits
- Soft, brushed grid interior traps air, managing your body’s microclimate to keep you warm & comfortable
- Material wicks sweat & dries really fast
- 4-way stretch material moves better in every direction
- Wide, flat waistband with a rise that sits just right on your hips
- Fitted: Streamlined fit that’s not too tight or too loose.
- Style #: 1343323
- Inseam: 29.5″
- 81% Polyester/19% Elastarell
- Imported
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Mom2025 Verified Buyer –
Got this for my daughter, she is a teacher. Keeps her warm through her sedentary day. We’ve tried other products with little success. The 4.0 is perfect.
GT1976 Verified Buyer –
The Under Armour base layer are the best thermals on the market!
CaitlinR Verified Buyer –
I received these and was super excited as I thought they were going to be the best. My friends have … Show Full Review This action will open a modal dialog.
mob1032 Verified Buyer –
These leggings are very warm and great for watching football games in the winter.