10 Best Mens Long Johns 2025 in the United States

The Thermajohn Long Johns Thermal Underwear is designed for men who need warmth and comfort in cold weather, making them an excellent choice for winter outings or simply lounging at home. A standout feature is the ultra-soft fleece lining, which provides exceptional warmth while maintaining comfort throughout the day. The moisture-wicking capability is another strong point, as it helps keep you dry by drawing sweat away from the skin, essential for both active and casual wear.

The 4-way stretch fabric is particularly beneficial for those who value freedom of movement, as it allows for flexibility without any uncomfortable chafing or bunching. As a base layer, these long johns excel at layering under clothing, making them suitable for outdoor activities or cozy nights in.

There are a few considerations to keep in mind. While the fabric is primarily polyester with a slight spandex blend, some users may prefer more natural fibers for breathability. Additionally, the fit, although designed for comfort, may not cater to all body types perfectly, and some might find them tighter than expected. Durability is generally acceptable, but as with many synthetic materials, there might be concerns about how well they hold up over time, especially with frequent washing. Despite being machine washable, proper care is essential to maintain the fabric's quality.

The Under Armour Men's ColdGear® Base 4.0 Leggings are designed for extreme cold weather, making them the warmest option in Under Armour’s baselayer lineup. Made from 100% polyester, these leggings have a soft, brushed grid interior that traps air to keep you warm and comfortable. The material is excellent at wicking moisture and dries quickly, which is crucial for maintaining comfort during intense activities.

The 4-way stretch construction ensures a good fit and unrestricted movement in all directions, and the performance elastic waistband adds to the comfort and fit. One notable feature is the UA Scent Control Technology, which helps in managing odor, making these leggings a good choice for prolonged use in the outdoors.

Since they are designed to provide extreme warmth, they might feel too heavy or bulky for less frigid conditions. Durability appears to be strong given the brand reputation, but users should follow care instructions closely to maintain the fabric's performance over time. These leggings are particularly suited for anyone planning to spend time in extremely cold environments, whether for sports, outdoor work, or recreational activities.

The Fruit of the Loom Men's Recycled Waffle Thermal Underwear Bottom in medium is crafted from a blend of U.S. sourced cotton and recycled polyester, making it an eco-friendly choice. The soft mini waffle fabric provides adequate insulation and warmth, making it suitable for cold to moderately cold weather.

The moisture-wicking and quick-drying properties are beneficial for staying dry and comfortable during wear. The reinforced flat seam construction adds to its durability, reducing the likelihood of seam tears over time. The fit is traditional and full-length, designed to be worn under clothing comfortably.

Given its composition of 52% cotton and 48% polyester, it strikes a balance between softness and durability. Machine washable care means easy maintenance. These long johns are a solid choice for staying warm and dry in cooler weather.