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Under Armour 4.0 Quarter-Zip Base Layer
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$110.00
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SKU: WX2*0746040
Overview
Built for the coldest conditions and slower-paced days outdoors, this base layer is designed to help manage warmth without adding bulk. Its brushed grid interior traps air close to the body, while moisture-wicking, fast-drying fabric and odor-control technology support comfort through changing effort levels. The quarter-zip neck gives you a simple way to release heat when needed, and the fitted, streamlined cut with 4-way stretch is made to move with you.
Why Hunters Choose the Under Armour
Extremely Cold
Temperatures or lower activity levels
Moisture-wicking Fabric
Helps move sweat away from
Fast-drying Material
Supports comfort during changing conditions
Odor-control Technology
Helps keep you fresher longer
Brushed Grid
Interior traps air to help
Key Features
- Under Armour's warmest base layer, built for extremely cold temperatures or lower activity levels.
- Moisture-wicking fabric dries quickly to help manage sweat during use.
- Odor-control technology helps keep the layer fresher, longer.
- Brushed grid interior traps air next to the body for added warmth.
- Quarter-zip neck lets you vent heat as needed.
- 4-way stretch material moves with you in a fitted, streamlined fit.
Best Used For
- Hunters sitting still in extremely cold conditions who need maximum warmth management.
- Lower-activity users needing a fitted base layer for late-season hunts and cold mornings.
- Anyone wanting a quarter-zip layer to vent heat during changing exertion levels.
- Serious outdoorsmen prioritizing moisture-wicking, fast-drying comfort under outer layers.
Specifications
| Closure Type | Quarter-zip neck |
|---|---|
| Fit | Fitted, streamlined fit |
| Interior | Brushed grid interior |
| Material | 93/7 polyester/elastane |
| Moisture Management | Moisture wicking and fast drying |
| Odor Control | Odor-control technology |
| Stretch | 4-way stretch material |
| Temperature Rating | Built for extremely cold temperatures or lower activity levels |
| Ventilation | Quarter-zip neck allows you to vent heat as needed |
Pros
- Built for extremely cold temperatures or lower activity levels.
- Moisture-wicking fabric helps move sweat away from the body.
- Fast-drying material supports comfort during changing conditions.
- Odor-control technology helps keep you fresher longer.
- Brushed grid interior traps air to help retain warmth.
- Quarter-zip neck lets you vent heat as needed.
Considerations & Trade-offs
- Designed as Under Armour’s warmest layer, so it may be more than you need for milder conditions or higher-output hunts.
- Best suited to extremely cold temperatures or lower activity levels; during active movement, you may need to use the quarter-zip for extra venting.
- The fitted, streamlined cut is built for layering and mobility, but it may feel more close-fitting than a relaxed base layer.
- Odor-control and moisture-management features help with comfort, but they do not replace the need to manage layering and exertion in the field.
Suggested Comparisons
- Heavyweight base layers
- Quarter-zip thermal tops
- Cold-weather hunting layers
- Moisture-wicking midlayers
Suggested Accessories
- Base layer top
- Midlayer insulation
- Moisture-wicking socks
- Neck gaiter
Frequently Asked Questions
What conditions is the Under Armour 4.0 Quarter-Zip Base Layer designed for?
It is described as Under Armour's warmest layer 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.
Can you vent heat if you start to overheat?
Yes. The quarter-zip neck is designed to let you vent heat as needed.
What fit should I expect under outer layers?
It has a fitted, streamlined fit, which is useful when layering.
What materials are listed for this base layer?
The listed material is 93% polyester and 7% elastane.