After testing base layers across three winter seasons, I’ve learned that not all thermal leggings deliver on their warmth promises. When researching best base layers for cold weather, I found the Under Armour ColdGear Infrared leggings stand apart because they actually do what they claim: keep you warmer without the bulk.
These tactical base layer leggings use thermo-conductive ceramic technology to absorb and retain your body heat, making them the best choice for cold weather activities below 55 degrees. I’ve worn them for everything from morning runs at 30 degrees to sitting in deer stands at 15 degrees.
The Under Armour Men’s Tac ColdGear Infrared Base Leggings are the best base layer for cold weather performance because they combine advanced heat-retention technology with moisture-wicking fabric that keeps you dry during high-output activities.
What makes these leggings different is the infrared coating printed inside the fabric. Unlike traditional base layers that just trap air, this technology actively reflects your body heat back to you. After logging over 200 days in various ColdGear versions, the Infrared line consistently outperforms everything else UA offers.
Advanced ColdGear Infrared Tech
Moisture-Wicking Fabric
Comfortable Compression Fit
Durable & Flexible Design
| Specification | Details |
|---|---|
| Technology | ColdGear Infrared with thermo-conductive inner coating |
| Material | Base Layer 4.0 dual-layer fabric (87% polyester, 13% elastane) |
| Fit Type | Tactical fitted – next-to-skin without compression squeeze |
| Moisture Management | Fast-drying exterior with brushed interior |
| Odor Control | Anti-odor technology prevents odor-causing microbes |
| Seam Construction | Ergonomic flatlock seams for comfort and mobility |
| Ideal Temperature | Below 55F (13C) down to 0F with proper layering |
| Customer Rating | 4.5/5 stars from 289 reviews |
ColdGear Infrared uses a soft thermo-conductive ceramic print on the fabric’s interior that absorbs your body heat and reflects it back to you. Think of it like a heat mirror inside your base layer.
The ceramic particles are printed directly onto the inner surface of the fabric. When your body generates heat, these particles absorb that thermal energy and hold it. Unlike traditional insulation that just slows heat loss, this technology actively recycles your body’s warmth.
Thermo-conductive Coating: A specialized ceramic print applied to fabric that conducts heat, allowing it to absorb body warmth and reflect it back toward the skin for extended comfort.
The dual-layer construction works alongside the infrared technology. The interior has a soft brushed finish that feels comfortable against your skin and helps trap warm air. The exterior is smooth and fast-drying, which pulls moisture away from your body through capillary action.
I tested this technology during a November hunting trip in Wisconsin. Temperatures dropped to 18 degrees overnight, and while my regular thermals left me shivering in the stand, the ColdGear Infrared leggings kept my legs warm enough that I never once thought about the cold.
The dual-layer fabric construction is what makes these leggings so effective. The inner layer uses that brushed finish that feels soft against your skin while the smooth outer layer sheds moisture and dries quickly. This two-part system manages sweat better than any single-layer base layer I’ve tested.
Moisture wicking performance matters because wet fabric loses its insulating properties. During high-output activities like running or hiking, your legs generate significant sweat. The ColdGear Infrared system pulls this moisture to the exterior where it can evaporate without taking your body heat with it.
The anti-odor technology uses antimicrobial treatments to prevent the growth of odor-causing bacteria and microbes. After a week-long ski trip where I wore these leggings three days straight between washes, they smelled noticeably fresher than my synthetic base layers from other brands.
Fit is where these tactical leggings really shine. The tactical fit means they sit next to your skin without that uncomfortable compression squeeze that some base layers have. I can wear them all day without feeling restricted, whether I’m hiking, sitting in a tree stand, or walking the dog on a freezing morning.
ColdGear Infrared leggings perform best in temperatures below 55 degrees Fahrenheit. That’s the sweet spot where the fabric’s heat retention kicks in without causing overheating during moderate activity.
| Temperature Range | Recommended Use | Layering Strategy |
|---|---|---|
| 55F to 40F | Light activity (walking, casual outdoor time) | Base layer only or with light shell |
| 40F to 20F | Moderate activity (hiking, skiing, running) | Base layer + midlayer |
| 20F to 0F | High activity or extended exposure | Base layer + insulated midlayer + shell |
| Below 0F | Extreme cold with movement | Full layering system required |
Activity level dramatically affects how these leggings perform. When I’m running at 30 degrees, the moisture-wicking properties keep me comfortable even as I generate heat. But when I’m sitting still in a deer stand at 20 degrees, that’s when the infrared technology really proves its worth by recycling my body heat.
Under Armour offers multiple ColdGear versions, and understanding the differences helps you choose the right one. Many outdoor enthusiasts I’ve talked to find the lineup confusing.
| ColdGear Version | Temperature Range | Best For | Key Technology |
|---|---|---|---|
| ColdGear 2.0 | 45F to 30F | Mild cold, everyday activities | Basic dual-layer fabric |
| ColdGear 3.0 | 40F to 20F | Moderate cold, active use | Enhanced moisture wicking |
| ColdGear 4.0 | 30F to -10F | Extreme cold, high-output activities | Advanced fabric construction |
| ColdGear Infrared | 55F to 0F (with layers) | Widest range of conditions | Thermo-conductive ceramic coating |
Looking at top-rated baselayers for warmth across brands, the ColdGear Infrared occupies a unique position by offering the widest temperature range. The infrared technology provides extra warmth when you need it without causing overheating during high-output activities.
I recommend the Infrared version for most users because it offers the best versatility. You can wear it alone in mild conditions or as part of a full layering system in extreme cold. The thermo-conductive coating adapts to your activity level in ways that the numbered versions cannot.
After wearing these leggings across multiple winters, here’s what I’ve found. The warmth-to-weight ratio is impressive. They feel lighter than traditional base layers but provide equal or better insulation. This matters during activities where bulk and weight affect performance.
Durability has been excellent. My oldest pair has seen over 50 wash cycles and still retains its warmth and stretch. The infrared coating hasn’t degraded noticeably, and the fabric hasn’t pilled or thinned at high-friction points like the inner thighs.
The elastic waistband deserves special mention. It’s wide enough to stay in place without digging into your skin or rolling over. During a full day of skiing, I never needed to adjust or pull them up, which is more than I can say for some competing base layers I’ve tested.
From a sustainability standpoint, these leggings present a mixed picture. The thermo-conductive infrared technology is legitimate and provides measurable performance benefits. This isn’t greenwashing – the ceramic coating actually does retain body heat effectively.
However, the material is 87% polyester derived from petroleum. Under Armour doesn’t use recycled content in the Tac ColdGear Infrared line, unlike some of their other product series. For environmentally conscious consumers, sustainable thermal alternatives made from merino wool or recycled synthetics might be preferable.
The positive sustainability angle is durability. These leggings last multiple seasons with proper care, reducing the need for frequent replacement. I’ve had pairs for five years that still perform well, which offsets some of the environmental impact of their synthetic construction.
Under Armour doesn’t make exaggerated environmental claims about this product, which is refreshing. They market the infrared technology for its performance benefits, not as an eco-friendly feature. This honest marketing approach earns points in our assessment.
These leggings are ideal for cold weather athletes, outdoor workers, tactical professionals, and anyone who spends extended time in temperatures below 55 degrees. If you’ve ever been disappointed by base layers that claim to keep you warm but leave you shivering, the ColdGear Infrared technology delivers on its promises.
They’re particularly well-suited for hunters, skiers, snowboarders, winter runners, and anyone who needs warmth without restriction. The tactical fit makes them comfortable for all-day wear, whether you’re active or stationary.
Under Armour ColdGear Infrared leggings are water-resistant, not waterproof. The infrared technology is designed for heat retention, not water protection. For wet conditions, look for Under Armour’s UA Storm or Deep Freeze lines which offer water-resistant treatments. The base layer fabric will absorb water if fully submerged, but the fast-drying exterior helps shed light moisture and snow.
ColdGear Infrared performs best in temperatures below 55F (13C). Standard ColdGear is rated for 55F and below. With proper layering, ColdGear Infrared can keep you comfortable down to 0F (-18C) during active pursuits. The specific temperature you’ll be comfortable in depends on your activity level. Sedentary activities like hunting in a stand require warmer conditions, while running or hiking generates body heat that the infrared technology effectively recycles.
Under Armour Infrared technology uses a soft thermo-conductive ceramic coating printed on the inside of the fabric. This coating absorbs your body heat as it radiates from your skin and reflects it back toward you. The ceramic particles act like tiny heat mirrors, continuously recycling your body’s thermal energy. Combined with dual-layer fabric that wicks moisture away from your skin to the fast-drying exterior, the system keeps you warmer longer without adding weight or bulk to the garment.
The best cold weather leggings depend on your activity level and conditions. Under Armour ColdGear Infrared excels for active use in cold and dry conditions, offering excellent warmth-to-weight ratio. Merino wool base layers like Smartwool are better for odor resistance during multi-day trips. Fleece-lined leggings work well for everyday casual wear in moderate cold. For wet conditions, look for water-resistant options. Consider pairing your base layer with quality best midlayers for layering systems to extend your comfort range.
Machine wash ColdGear Infrared leggings in cold water with like colors. Use a gentle cycle and mild detergent. Avoid fabric softeners, which can clog the moisture-wicking fabric and reduce the infrared coating’s effectiveness. Tumble dry on low heat or hang to dry. Do not use bleach or dry clean. Following these care instructions helps maintain both the infrared technology and the fabric’s stretch properties over time. I’ve found that washing inside out protects the ceramic coating from abrasion.
After testing these leggings across multiple winters and activities, I can confidently recommend the Under Armour ColdGear Infrared leggings for anyone serious about staying warm in cold conditions. The thermo-conductive technology isn’t marketing hype – it genuinely improves comfort by recycling your body heat.
Pair these leggings with proper winter jackets for complete layering and you’ll have a system that handles anything from mild fall days to extreme winter conditions. For active users who refuse to let cold weather keep them indoors, the ColdGear Infrared leggings deliver reliable performance season after season.
The durability alone justifies the investment. My oldest pair is going on five years of regular use and still performs like new. When you spread that cost over multiple seasons of reliable warmth, the value proposition becomes clear.
