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Under Armour
Base 4.0 Crew - Men's

4.0519480519480515 out of 5 stars
77 Reviews

Out of Stock

Don't worry though, we have a lot more Men's Baselayer Tops in stock than that.

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Base 4.0 Crew



Details

  • Heavyweight baselayer top designed for the coldest winter pursuits
  • Soft grid fabric traps air against the skin to keep you warm
  • Wicks moisture and dries quickly to keep sweat from freezing
  • Four-way stretch construction moves with you during cold ski days
  • Anti-odor technology keeps you smelling fresh on multi-day trips
  • Item #UND02S3
Material
78% polyester, 22% elasterell
Insulation Weight
heavyweight
Fit
fitted
Style
crew
Anti-Odor
UA Scent Control
Recommended Use
skiing, snowboarding, hiking, snowshoeing, mountaineering, winter camping
Manufacturer Warranty
limited lifetime

Overall Rating

4 based on 77 ratings

Review Summary

1 Stars - 12 reviews
2 Stars - 4 reviews
3 Stars - 4 reviews
4 Stars - 5 reviews
5 Stars - 52 reviews

What do you think about this product?

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5 out of 5 stars

February 9, 2024

Live by these in the winter

I spend alot of time working outside In the winter these are phenomenal during the cold snaps

Mike0815
Under Armour

Originally reviewed on Under Armour

5 out of 5 stars

February 2, 2024

Warm and durable

This was warm and durable. It kept me warm in the Alaska cold winter. I wish it had the thumb holes like on the ladies though…these are awkward!

RickyLS
Under Armour

Originally reviewed on Under Armour

5 out of 5 stars

January 16, 2024

Warm and comfy

This product is awesome. I wasn't expecting it to keep me as warm as it did. It's thicker than most of my so called cold weather gear. It fits tight but doesn't bother my skin like the others.

curbyc42
Under Armour

Originally reviewed on Under Armour

2 out of 5 stars

January 14, 2024

These use to be the best but they have changed

I have older pairs of these that had a square grid pattern that were wicked warm. The ones I have are covered in holes from a lot of use but at some point they changed these and they are not nearly as warm or thick as the old 4.0. Please bring back that old square grid, they weee so warm.

Peter KG
Under Armour

Originally reviewed on Under Armour

5 out of 5 stars

January 2, 2024

Great for winter sports

Very comfortable and warm.

Dr JR
Under Armour

Originally reviewed on Under Armour

5 out of 5 stars

December 27, 2023

Great base layer

I use these as next to skin layer, wool as next layer and cotton FR hoodie as top layer and Im warm down to neg 20 with 0 18 mph wind, no coat. Hard use in ND oil fields and these are still going strong. I own at least 10 pairs of the 4 0. Every good hand I know owns a set of the 4 0. Australian minus 55 Meranio wool is irreplaceable, but combined with 4 0, is a cold weather life hack. Size runs small, normally wear L but with 4 0 I use XL

CodeMoab2
Under Armour

Originally reviewed on Under Armour

5 out of 5 stars

December 24, 2023

Great gear

I have and own several brands of long johns as I am often outside for work and hunting. I reluctantly bought the 4.0 top and bottom to see if the reviews were for real. Well, it does, so I now own 2 sets!

Guy Pusey
Under Armour

Originally reviewed on Under Armour

5 out of 5 stars

December 22, 2023

Base 4.0

Only cold weather shirt I wear...

Under Armour

Originally reviewed on Under Armour

4 out of 5 stars

December 17, 2023

Haven’t worn yet to give a good review but just from the feel and comfort of trying on it feels like it’ll be everything it’s supposed to be

Dave72
Under Armour

Originally reviewed on Under Armour

5 out of 5 stars

December 8, 2023

Warmth in the cold

Amazingly warm! Best thing for cold winter days hunting

KyHunter198229
Under Armour

Originally reviewed on Under Armour