Under Armour Mens Packaged Base 4.0 Leggings - Extreme Warmth

In this review of the Under Armour Mens Packaged Base 4.0 Leggings the bottom line is simple: these are for men who need the warmest baselayer for truly cold conditions. Built as Under Armour's warmest ColdGear offering, the Base 4.0 locks heat close to the body with a soft, brushed grid interior that traps air and manages your microclimate. The construction emphasizes warmth and moisture control over lightweight versatility, so buyers looking for reliable insulation during winter runs, hunting or extended outdoor work will appreciate its design.

Key Features

• Extreme warmth: The Base 4.0 construction traps air against the skin to retain heat in subzero and extreme cold conditions.
• Soft brushed grid interior: The grid fabric feels comfortable against skin while creating air pockets that help regulate body temperature.
• Moisture wicking: The material moves sweat away and dries quickly so the baselayer stays dry during activity.
• 4-way stretch: Stretch fabric allows full range of motion for running, training or layering under other pants.
• Functional waistband and fly: A performance elastic waistband and working fly add everyday practicality for extended wear.
• Scent control: UA Scent Control Technology helps reduce odor signature during outdoor pursuits.

Who It's For

These leggings are aimed at men who spend significant time outside in cold weather and need a baselayer that maximizes trapped warmth without adding bulk. They work well for winter running at low to moderate intensity, hunting where scent control matters, and layered cold-weather training or chores.

Not everyone will prefer them: if you want a lightweight baselayer for high-output workouts or a looser fit for casual wear, look elsewhere. The fit receives mixed feedback, so buyers who need a precise or roomy fit should try them on when possible.

Pros & Cons

Pros

• Exceptional warmth from the brushed grid interior that retains heat without heavy bulk.
• Material wicks sweat and dries fast, helping comfort during activity and temperature changes.
• 4-way stretch construction and elastic waistband deliver mobility and a secure fit during movement.
• Built-in scent control adds value for hunting and long outdoor sessions.

Cons

• Fit is hit-or-miss for some customers, with mixed reports about sizing and feel under different outer layers.
• No pockets are provided, limiting carrying options if used as a standalone layer.

Specifications

Brand	Under Armour
Model	Base 4.0 Extreme Baselayer
Intended use	Cold weather baselayer for extreme cold
Interior	Soft, brushed grid
Stretch	4-way stretch construction
Waist	Performance elastic waistband with working fly
Inseam	30.5 in

Our Verdict

The Under Armour Mens Packaged Base 4.0 Leggings are a strong choice for anyone prioritizing warmth and temperature control in extreme cold. They combine a comfortable brushed interior, moisture management and scent control into a practical baselayer; just confirm sizing before purchase if you prefer a specific fit. For cold-weather athletes and outdoor workers they represent good value for performance-oriented insulation.

Frequently Asked Questions

Are these leggings good for subzero temperatures?
Yes. The Base 4.0 is designed as Under Armour's warmest baselayer and traps heat with its brushed grid interior for subzero and extreme cold conditions.

Do they wick sweat during activity?
Yes. The material wicks moisture and dries quickly, helping maintain comfort during winter runs and layered activities.

Do these leggings have pockets?
No. These leggings do not include pockets, so they are best used as a baselayer under other garments.