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.
Features
- 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 construction moves better in every direction
- Performance elastic waistband
Specs
- Working fly
- Inseam: 29.5″
- 81% Polyester/19% Elastarell
- A slimmer, athletic cut that allows total mobility but eliminates the bulk of extra fabric.
- Imported
Care
- Machine wash cold with like colors
- Use only non-chlorine bleach when needed
- Tumble dry low
- Do not iron
- Do not use softeners
- Do not dry clean



















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