10 Best Mens Thermal Underwear 2025 in the United States

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 Carhartt Men's Force Midweight Waffle Base Layer Pant is designed to keep you warm and dry during cold weather activities. Made from 100% polyester with Carhartt’s Force technology, it effectively wicks sweat away from your skin and dries quickly, helping you stay comfortable and reducing the chance of getting chilled. The midweight fabric strikes a good balance—not too heavy but warm enough for layering, while the waffle knit texture adds insulation without bulk.

In terms of fit, it offers a contoured front with a fly and a brushed elastic waistband that feels soft and stays in place. The flatlock seams reduce chafing when you move around, and the tagless design eliminates irritation from labels. The fabric is synthetic, which may not feel as natural as cotton to some, and sizing advice suggests buying a larger size if you’re between sizes, indicating it might run a bit snug for certain builds.

This pant is well suited for men needing reliable warmth and moisture control in cold or active conditions, such as working outdoors or layering for winter sports.

The Under Armour Men's ColdGear Armour Compression Mock is designed to keep you warm and comfortable during cold weather activities. Made from dual-layer fabric, its brushed interior provides extra warmth while the smooth exterior dries quickly. The material's 4-way stretch construction ensures excellent mobility, making it suitable for various activities. Additionally, the stretch-mesh panels at the back and underarms offer strategic ventilation, preventing overheating without compromising warmth.

This thermal underwear also excels in moisture-wicking, efficiently managing sweat and keeping you dry throughout the day. The compression fit provides a snug, second-skin feel, which can be great for layering but might feel too tight for some users. The mock neck construction adds further coverage to protect against the cold.

One potential drawback is that the ultra-tight fit might be uncomfortable for those who prefer a looser fit. Furthermore, while the fabric's durability is beneficial for active use, some users might find the care instructions requiring machine washing a bit inconvenient. This thermal underwear is ideal for those engaging in cold-weather sports or outdoor activities and prefer a tight, supportive fit. However, it might not suit those looking for a more relaxed or casual thermal option.