6 Best Under Armour Thermal Underwear 2025 in the United States

The Under Armour Men's ColdGear® Base 4.0 Leggings are designed for extreme cold conditions, making them ideal for outdoor activities in harsh winter weather. The material is 100% polyester, which is durable and lightweight. The leggings feature a soft, brushed grid interior that traps air, keeping you warm and comfortable. They also have excellent moisture-wicking properties, ensuring that sweat is quickly drawn away from your skin to keep you dry.

The 4-way stretch construction allows for greater flexibility and movement in all directions, providing a comfortable fit without restricting motion. Additionally, the leggings include UA Scent Control Technology to minimize odor, which is a great feature for prolonged wear. These leggings are best suited for individuals who need reliable thermal wear for extreme cold, such as winter sports enthusiasts or those working in very cold environments.

The Under Armour Women's ColdGear® Base 4.0 Leggings are designed for extreme cold conditions. Made from 100% other fibers, these leggings feature a soft, brushed grid interior that traps air to keep you warm and comfortable. The material is highly effective at wicking sweat and drying quickly, making it suitable for active pursuits.

The leggings offer a 4-way stretch construction, allowing for easy movement in all directions, and the wide, flat waistband ensures a comfortable fit that sits just right on the hips. Additionally, the UA Scent Control Technology helps manage odor, which is beneficial for extended wear. Their durability will depend on how well they are cared for, as indicated by the machine wash care instructions.

These leggings are a great choice for anyone looking for warmth and comfort in extreme cold conditions.

The Under Armour Men's ColdGear® Base 3.0 Leggings are designed for cold weather activities, offering midweight warmth suitable for various activity levels. These leggings are made from 100% polyester, which contributes to their durability and lightweight feel. The soft brushed grid interior is a standout feature, as it helps trap air and maintain warmth, ensuring comfort during cold temperatures.

Additionally, the material wicks sweat and dries quickly, enhancing comfort during intense activities. Another benefit is the 4-way stretch construction, allowing for better movement in any direction. The performance elastic waistband ensures a snug fit without being restrictive. The leggings also feature UA Scent Control Technology, which helps keep odor at bay, making them ideal for prolonged use.

Despite these strengths, there are a couple of considerations. The product requires specific care instructions such as avoiding ironing, dry cleaning, and the use of softeners, which might be inconvenient for some users. Moreover, while the polyester material is durable, it may not be as breathable as some natural fibers. These leggings are best suited for individuals who engage in outdoor activities in cold weather and need reliable, moisture-wicking, and odor-resistant base layers that offer flexibility and warmth.