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Under Armour Base Layer 4.0 Bottom - Boys'


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  • Black 2 - Unavailable

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Base Layer 4.0 Bottom

  • Cozy baselayer bottoms built for the coldest ski days
  • Heavyweight fabric keeps them comfortable and warm on the slopes
  • ColdGear technology keeps them from being too hot or too cold
  • Moisture transport system prevents sweat from freezing over
  • Four-way stretch fabric lets them move in all directions
  • Form-fitting design traps body heat and makes it easy to layer over
  • Item #UND02S7

81% polyester, 19% elasterell
Insulation Weight
Recommended Use
skiing, snowboarding, hiking, nordic skiing, casual
Manufacturer Warranty
limited lifetime

Tech Specs

What do you think about this product?


>Rating: 5

Base layer 4.0

I've used it several times
True to size
Size Bought
Youth large
5` 0"
80 lbs

I bought these for my 11year old son. He uses them for skiing under very lightly insulated ski pants. He says they keep him plenty warm and the fleece on the inside is soft.

>Rating: 5

The best customer service

I returned this product before using it
Runs small

I made a mistake on my order and they took care of me!. 100% the best customer service ! Under Armour does run a size small imo