Base 4.0 Crew - Men's
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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
Reviews
Q&A
What do you think about this product?
Overall Rating
4 based on 105 ratings
Review Summary
Customer Images
Here's what customers have to say
The product provides exceptional warmth and comfort for a variety of outdoor activities in cold weather. Many users praise its ability to keep them warm without excessive sweating. However, some customers prefer the previous design, finding it warmer and more durable. There are also mixed opinions on the fit, with some users reporting the newer version as too long or loose. Overall, the product is a recommended cold weather base layer, though the company may want to consider feedback on the newer design.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageOctober 21, 2025
Not warm
I bought ua base layer 4.0 because it says it will keep you warm down below zero!! I put on the pants and shirt 4.0 and put on a t shirt and overalls. The temperature outside was 45 so I thought I should be ok. Boy was I wrong!!! I could only stay out there hunting for two hours. I was freezing and not enjoying the hunt. I could have bought 5-6 sets of cheaper base layers for what I paid for these!! I will never spend my money for under armor products again. Under armor does not work as described by manufacturer, so buy cheap base layers since you have to wear a bunch of clothes to stay warm!!! Don’t waste your money on these!!!!
Originally reviewed on Under Armour
February 6, 2025
Works great keeps me warm during the cold days.
Originally reviewed on Under Armour
February 5, 2025
Great Base.
Fits like a glove, great material, true sizing.
Originally reviewed on Under Armour
February 3, 2025
Great product
Keep me warm while doing ice rescue training
Originally reviewed on Under Armour
January 28, 2025
4.0 Coldgear is 5 Stars
South Carolina experienced extreme cold weather this winter, but while wearing my 4.0 crewneck, the cold weather did not phase me not one bit. I see why the athletes opt for this gear during cold weather games.
Originally reviewed on Under Armour
January 24, 2025
Baselayer 4.0
Absolutely amazing - wore on single digit weather and only my hands and feet were cold
Originally reviewed on Under Armour
January 7, 2025
Great Product
I bought these for my boyfriend who is an avid hunter and Lineman, he loves them! They keep him warm without getting sweaty!
Originally reviewed on Under Armour
January 3, 2025
Great replacement for a coat
I don’t like wearing a coat in Wisconsin. I wanted a solution that provided warmth while still fitting my aesthetic. This base layer 4.0 has been perfect for me. It’s fitted, not bulky and makes a huge difference in keeping my chest and arms warm with just a long sleeve on top of it. I recommend!
Originally reviewed on Under Armour
December 31, 2024
Warm, Comfortable, and Reliable
This base layer is a game changer for cold weather. It is incredibly warm without being bulky it fits perfectly and wicks moisture like a pro. Ideal for any winter activity highly recommend!
Originally reviewed on Under Armour
December 30, 2024
Well made
Purchased for tactical operations. Well made product with great heat retention. Used during cold weather operations and these extended the operational time of individuals, making relief operations an easier task. May be too warm in an active environment.
Originally reviewed on Under Armour
Do you have a question about this product?
October 9, 2022
I had the ua metal is the 4.0 the new version of that cause the metal was amazing at extremely cold temperatures like sub 0 Temps and I'm looking for something like that again
Originally reviewed on Under Armour
March 1, 2022
What's the arm length in small vs. medium?
Originally reviewed on Under Armour
December 15, 2021
How to care for Base4.)
Originally reviewed on Under Armour
November 4, 2021
Does any one else get a burning itch when you start sweating
Originally reviewed on Under Armour
January 10, 2021
I am seeking for base layer for golfing at 25 F. Please recommend best options.
Originally reviewed on Under Armour
December 13, 2020
What is the arm length on the XL vs the XXL?
Originally reviewed on Under Armour
March 26, 2020
Hello, How much does the Under Armour Packaged Base 4.0 Crew Shirt weight? Do you have an exact measurement? I am curious about the Small and Medium sizes. Thanks! Asaf
Originally reviewed on Under Armour
January 4, 2020
I currently own a older base model (about 5 to 6 years old) that does not have the rating on it. and a newer model base layer about two years old what would be the difference between what I have and the new product?
Originally reviewed on Under Armour
November 16, 2019
I need something for warmth in outside temps of 15 degrees F
Originally reviewed on Under Armour
October 28, 2019
I looked at the ratings and saw that the long sleeve runs small
Originally reviewed on Under Armour
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