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 2.0 Leggings MD Black are designed for high activity in cool conditions. Made from 100% polyester, the material is lightweight yet durable, offering flexibility and breathability. The soft, brushed grid interior is excellent for trapping air and managing your body's microclimate, ensuring you stay warm and comfortable.

The leggings feature UA Scent Control Technology, which helps in odor resistance, making them suitable for long wear during various pursuits without the concern of bad smells. They also have moisture-wicking properties, allowing sweat to be effectively drawn away from your skin, keeping you dry and ensuring the material dries quickly. The 4-way stretch construction adds to the flexibility, allowing ease of movement in all directions, which is ideal for active use.

The performance elastic waistband ensures a snug fit without being too tight or uncomfortable. The care instructions are quite specific and require attention to maintain the fabric's quality, including machine washing with like colors and avoiding softeners and dry cleaning. The weight of the leggings is relatively light at 1.4 pounds, making them easy to wear without feeling bulky. These leggings are ideal for men who need reliable thermal underwear for activities in cooler weather, combining warmth, comfort, and durability with effective moisture and odor management.