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Under Armour 4.0 Base Layer Crew
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$100.00
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SKU: WX2*0746041
Overview
Built for severe cold and lower-output days, this base layer is designed to help hunters stay comfortable when temperatures drop and movement slows. Its brushed grid interior is intended to trap air close to the body, while the moisture-wicking, fast-drying fabric helps manage sweat during changing conditions. A quarter-zip neck adds venting options when you need to release heat, and the fitted, streamlined cut with 4-way stretch supports easy layering under outerwear. Odor-control technology is included for extended wear in the field.
Why Hunters Choose the Under Armour
Extremely Cold
Temperatures or lower activity levels
Moisture-wicking, Fast-drying
Fabric helps manage sweat
Odor-control Technology
Helps you stay fresher longer
Brushed Grid
Interior traps air next to
Quarter-zip Neck
Lets you vent heat as
Key Features
- Under Armour's warmest base layer, built for extremely cold temperatures or lower activity levels.
- Moisture-wicking, fast-drying material helps manage sweat during cold-weather wear.
- Odor-control technology helps you stay fresher, longer.
- Brushed grid interior traps air next to the body to help retain warmth.
- Quarter-zip neck lets you vent heat as needed.
- 93/7 polyester/elastane blend with 4-way stretch and a fitted, streamlined fit.
Best Used For
- Extremely cold hunts where maximum warmth is needed during low-activity sits or glassing
- Hunters who want a fitted base layer that moves with them under outer layers
- Early-season to late-season layering systems needing moisture management and quick drying
- Long days in the field where odor control and heat venting matter
- Outdoor users facing cold conditions and wanting a warm, streamlined crew
Specifications
| 4 Way Stretch | Yes |
|---|---|
| Fast Drying | Yes |
| Fit | Fitted, streamlined fit |
| Intended Use | Extremely cold temperatures or lower activity levels |
| Interior | Brushed grid interior |
| Material | 93/7 polyester/elastane |
| Moisture Wicking | Yes |
| Neck Style | Quarter-zip neck |
| Odor Control | Yes |
| Warmth Level | Under Armour's warmest layer yet |
Pros
- Built for extremely cold temperatures or lower activity levels.
- Moisture-wicking, fast-drying fabric helps manage sweat.
- Odor-control technology helps you stay fresher longer.
- Brushed grid interior traps air next to the body.
- Quarter-zip neck lets you vent heat as needed.
- 4-way stretch material supports unrestricted movement.
Considerations & Trade-offs
- Designed as Under Armour's warmest layer, so it may be more insulation than you want for higher-output hunts or milder conditions.
- Best suited to extremely cold temperatures or lower activity levels; it is not positioned as a versatile all-season base layer.
- The fitted, streamlined cut is intended to stay close to the body, which may feel less relaxed than looser layering options.
- The quarter-zip adds venting control, but it also introduces a bit more complexity than a simple crew neck design.
Suggested Comparisons
- Base layer tops
- Quarter-zip thermal tops
- Cold-weather hunting apparel
- Moisture-wicking base layers
Suggested Accessories
- Base layer bottoms
- Insulating midlayer
- Merino socks
- Gloves
Frequently Asked Questions
What kind of conditions is the Under Armour 4.0 Base Layer Crew designed for?
It is described as Under Armour’s warmest layer yet and is built for extremely cold temperatures or lower activity levels.
Does this base layer help manage moisture during a hunt?
Yes. The product description says the material wicks sweat and dries really fast, with moisture-wicking and fast-drying performance noted in the long description.
Does it have any features for temperature control while moving?
Yes. It has a quarter-zip neck that allows you to vent heat as needed.
What fit should I expect from this base layer?
It is described as having a fitted, streamlined fit.
What is the material content of the Under Armour 4.0 Base Layer Crew?
The listed material is 93% polyester and 7% elastane.