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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Kristy w Verified Buyer –
The best cold weather gear I have gotten yet!
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.
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.
mob1032 Verified Buyer –
These leggings are very warm and great for watching football games in the winter.
GT1976 Verified Buyer –
The Under Armour base layer are the best thermals on the market!
Jea970 Verified Buyer –
Absolutely the best base layer I’ve ever worn. I’m always cold. I can sit in a 69-degree house and not freeze but not sweat when it’s 74 degrees either. Outdoors at 20 degrees, I was toasty warm.
Lea F Verified Buyer –
These tights work great as a base layer. Out hiking in 6* F weather. Work great under hiking pants. I wish they were a little longer. I’m 6ft tall and I have to stretch them out of the wash. Otherwise perfect.
Mrs Marcellini Verified Buyer –
truly a must have warmer if you are a skier or like to be in cold weather! I had used these for years and I am so happy with them!!! Just buy! true to size, I am usually a XS/small and got a small on these.