10 Best Mens Long Johns 2026 in the United States

The Fruit of the Loom Men's 3-Pack Recycled Waffle Thermal Underwear Bottom is crafted from a soft mini waffle fabric made of 52% cotton and 48% recycled polyester. This blend provides a comfortable feel and adequate warmth, suitable for cold to moderately cold conditions. The waffle texture aids insulation while allowing moisture to wick away, preventing clamminess during wear. Featuring a pull-on design, these long johns deliver a relaxed fit, making them easy to layer under pants without feeling tight or restrictive. The fabric is quick drying, enhancing comfort during activity or sweat.

The reinforced flat seam construction suggests durability and reduced skin irritation. Though there is no explicit mention of odor resistance beyond moisture-wicking, the recycled polyester component may help reduce smell build-up compared to cotton alone. The product is machine washable, offering simple maintenance. One limitation is that the insulation is best suited for cold but not extreme cold environments, which may make these less ideal for very harsh winter conditions. Additionally, the traditional pull-on fit may not provide the snug compression preferred by some for athletic use.

These long johns serve as a practical option for everyday wear in cooler weather, combining comfort, sufficient warmth, and durability with an eco-friendly fabric blend.

The Carhartt Men's Force Midweight Classic Thermal Base Layer Pant offers several notable strengths. Made of 100% polyester, it features a waffle knit design that traps heat and keeps you warm. The material is lightweight yet effective in providing insulation. The moisture-wicking property ensures that sweat is pulled away from the skin, keeping you dry, which is crucial for comfort during colder months. Additionally, these pants combat odors, making them ideal for prolonged use.

The rugged flex technology allows for greater ease of movement, which is a huge plus for active wearers. Comfort is further enhanced by smooth flatlock seams, a tagless label, and a concealed dry low-stitch waistband that prevents irritation. The contoured front design also adds to the comfort level by providing a better fit and reducing chafing.

However, there are some potential drawbacks. Because the pants are made of polyester, they may not offer the same breathability as natural fibers like cotton or wool. Some users might also find polyester less comfortable against the skin. Additionally, since these are designed to be a base layer, they may not be suitable as stand-alone pants for activities outside the home. The Carhartt Men's Force Midweight Classic Thermal Base Layer Pant is a solid choice for those seeking durable, flexible, and comfortable long johns suitable for cold-weather activities.

The MERIWOOL Men’s Base Layer Thermal Pants are made from 100% superfine Merino wool, known for being soft and comfortable without the itchiness often associated with wool. At 250g/m2 weight, these pants offer a good balance, keeping you warm in cold weather while still breathable enough to prevent overheating, making them suitable as either a base or mid-layer. The fit is next-to-skin and low rise, which means they are snug but stretchable enough to wear under other garments comfortably.

One of the big pluses is Merino wool’s natural ability to wick moisture away from your skin and resist odors, so you stay dry and fresh even during active outdoor use like hiking or skiing. These pants are also quick-drying and come with a loop for easy hanging, adding convenience when you're on the move. They are machine-washable, though cold wash and low heat tumble dry are recommended to maintain their quality.

Merino wool can be more delicate than synthetic fabrics, but this product offers a solid 90-day warranty against defects, showing confidence in its durability. These thermal leggings are ideal for men who want a natural, comfortable, and functional base layer for outdoor activities in chilly conditions. If you prefer easy-care or heavier insulation, or need a looser fit, it may be worth comparing with other options.