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, locking in your body’s heat to deliver extreme warmth in the extreme cold
- UA Scent Control Technology to keep you undetected in all pursuits
- Soft, brushed grid interior traps air against your skin, closely 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
- Fitted: Streamlined fit that’s not too tight or too loose.
- Style #: 1353351
- 78% Polyester/22% Elasterell
- Imported
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Jea970 Verified Buyer –
The fit is loose but not so lose that I would exchange for a smaller size. The shirt is warm but not too warm when inside. Outside it keeps me toasty at 30 degrees and I’m always complaining of being cold. All in all, I’m very happy with this purchase.
KarenK11 Verified Buyer –
I am always cold. This is the solution! Love it!
SnowFan Verified Buyer –
I have a number of old 3.0 tops and decided to try the 4.0. It does the job keeping me warm while sn… Show Full Review This action will open a modal dialog.
Crew84 Verified Buyer –
As someone who trains/plays outdoors all year (in Chicago where that can mean sub-zero, freezing rai… Show Full Review This action will open a modal dialog.
Mom2025 Verified Buyer –
Got this for my daughter, she is a teacher. Her room is cold and then she has bus duty periodically. So the 4.0 is perfect for being somewhat sedentary. Surprisingly, actually keeps her warm! She is a chilly person normally, so cold temps are miserable for her. We’ve tried many products. The Under Armour is work the investment!
East Coaster Verified Buyer –
These are the best long underwear going.
I mind the cold but not when wearing these.
SheenamK Verified Buyer –
Very comfortable, warm, and correctly advertised
Dr JR Verified Buyer –
Very comfortable and warm.
Skion Verified Buyer –
This is a great base layer and is comfortable under my ski jacket and pullover.