10 Best Mens Thermal Pants 2025 in the United States

The Under Armour Men's HeatGear Armour Leggings are designed with the active man in mind, offering several features that make them suitable for various athletic activities. Made from a blend of 84% polyester and 16% elastane, these leggings are lightweight and provide a snug, compression fit that feels like a second skin. This ultra-tight fit supports muscle performance and reduces fatigue, making it ideal for high-intensity workouts.

The material excels in moisture-wicking, quickly absorbing sweat and drying fast to keep you comfortable during exercise. Strategic mesh panels are integrated for added ventilation, ensuring breathability in key areas. The ergonomic design minimizes seam placement in high abrasion areas, enhancing durability and comfort. The wide, exposed elastic waistband ensures a secure fit without digging into the skin, and the leggings include a convenient drop-in pocket for small items.

The lack of a fly might be a minor inconvenience for some. The leggings are easy to care for with machine wash instructions, though it’s important to follow specific guidelines to maintain their quality. These leggings are a solid choice for individuals looking for supportive, moisture-wicking thermal pants for various physical activities.

These thermal pants from Fruit of the Loom are made from a blend of 52% cotton and 48% recycled polyester, which makes them soft and environmentally friendly. The mini waffle fabric design is great for providing warmth and insulation, especially in cold to moderately cold weather. Thanks to the moisture-wicking and quick-drying properties, they help keep you dry and comfortable during activities or long wear.

The pull-on style is simple and convenient for everyday use. Reinforced flat seam construction means the pants are less likely to irritate your skin or come apart easily, adding to durability and comfort. These long johns offer a traditional fit designed to be close to the body.

These thermal pants are a solid choice for men looking for comfortable, eco-conscious thermal underwear that balances warmth with moisture management. However, if you need a highly stretchy or heavyweight option for extreme cold or intense activity, you might want to consider alternatives.

The Carhartt Men's Force Midweight Waffle Base Layer Pant is a solid choice for anyone looking for comfortable and functional thermal pants. Made from 100% polyester with Carhartt's Force technology, these pants do a good job at wicking sweat and drying quickly, which helps keep you dry and comfortable during active use or cold weather. The midweight waffle knit adds warmth without feeling too bulky, making it a versatile base layer. The flatlock seams are thoughtfully placed to reduce chafing, improving comfort during extended wear. The brushed elastic waistband with concealed stitching provides a snug but flexible fit, and the contoured front with a fly adds practical detail. While the pants offer good elasticity for ease of movement, the pull-on closure keeps things simple but may not suit everyone depending on personal fit preference. Sizing advice suggests going for the larger size if you’re between measurements, which can help avoid feeling too tight.

The fabric is polyester, so if you prefer natural fibers, this might feel less breathable. Also, while they do fight odor, they may require regular washing after heavy use. These pants perform well for those needing reliable warmth, moisture management, and comfort in a base layer for outdoor or everyday winter wear.