5 out of 5
Under Armour Men's ColdGear Base 4.0 Crew
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Product Description
UA Base 4.0 is a men's baselayer 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
- 78% Polyester/22% Elasterell
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Specifications
| Size Name | S / M / L / XL / 2XL / 3XL |
| Gender | Male |
| Age | Adult |
| Material Type | Polyester |
| Lifestyle | Athletic |
| Sleeve Type | Long Sleeve |
| Fit Style | Stretch |
Return Policy
This item is non-returnable.
Custom Printing & Artwork
This item can be imprinted with a company's name, logo or message. We've got the solution that will exceed your expectations and fit within your budget. Let us help with your needs of custom production, large or small. To discuss your specific needs please Contact Us. If you email, please include the following information to speed up the process: your company name and contact information, logo, order quantity, delivery deadline, and specific needs.
How do I send my artwork?
Click here for all you need to know about sending your logo or artwork to us.
Need more information?
Our staff are available to answer any questions you may have about this item
Our staff are available to answer any questions you may have about this item
Customer Reviews
By A Customer
Date: December 02, 2025
Fits perfectly. Keeps me warm in below freezing temperatures with wind chills.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By Shann B D
Date: October 25, 2025
Great product. Will keep you warm in freezing temperatures.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Jovanny Ordaz
Date: October 23, 2025
Perfect for work
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By DJBnice
Date: September 19, 2025
Already wrote a review on the 4.0 bottom - in a nut shell these fit great, keep you super warm and are super comfortable. They are worth the money!
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Keith begraft
Date: August 10, 2025
Heavy duty
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By avishai
Date: July 27, 2025
great
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]