10 Best Mens Thermal Underwear 2025 in the United States

The Thermajohn Long Johns Thermal Underwear for Men is a solid choice for cold-weather gear. Made from a blend of 92% Polyester and 8% Spandex, this set offers a good balance of durability and flexibility. The ultra-soft fleece lining ensures comfort and warmth, making it ideal for cold climates.

Weighing around 14 ounces, these thermals are lightweight enough for layering without feeling bulky. The 4-way stretch material provides excellent freedom of movement, reducing the risk of chafing or bunching up, which is a great plus for active users. Additionally, the moisture-wicking properties help keep you dry by effectively drawing sweat away from your body, making it suitable for both outdoor activities and indoor use as pajamas.

These thermals are best suited for those looking for a comfortable, functional, and affordable option for staying warm during winter activities or everyday wear.

The Amazon Essentials Thermal Long Johns Underwear Set for Men offers a mix of comfort and functionality. Made from a cotton-poly blend (60% cotton, 40% polyester), these thermals are designed to be both soft and breathable, which is beneficial for everyday wear. The slim fit design ensures the thermals contour well to your body, providing a snug fit through the shoulders, chest, waist, hips, and thighs, with a tapered leg opening for added comfort. The lightweight construction means you get warmth without the bulk, making it ideal for layering under other clothing during cold weather.

The set includes a waffle knit top with a classic crew neckline and leggings with an elastic waist and rib cuffs, which enhance comfort and ensure they stay in place throughout the day. These thermals are machine washable, adding to their convenience. However, the blend of materials may not wick moisture as effectively as some high-performance fabrics, which could be a drawback for those engaging in intense physical activities.

Additionally, the slim fit might not be comfortable for everyone, especially those who prefer a looser fit. Despite these minor drawbacks, the Amazon Essentials Thermal Long Johns Underwear Set is a reliable and affordable option for men looking for basic thermal wear to keep warm in colder conditions.

The Fruit of the Loom Men's Recycled Premium Waffle Thermal Underwear Long Johns Bottom is made from a blend of U.S.-sourced cotton and recycled polyester. The material is soft and incorporates a mini waffle fabric design, which provides insulation and warmth suitable for cold to moderately cold conditions. This makes it a good choice for everyday wear during the winter or for outdoor activities in chilly weather.

The moisture-wicking and quick-drying properties are strong points, ensuring that you stay dry and comfortable even if you perspire. The reinforced flat seam construction adds to the durability and comfort by reducing the chances of chafing. The pants are pull-on style, which might not be the most convenient for everyone.

The fit appears to be traditional and full-length, which should work well for most people seeking thermal underwear. The product is machine washable, making it easy to care for. Available in black and large size, it offers practical and functional thermal wear for men. This thermal underwear is ideal for anyone looking for reliable warmth and comfort during colder months.