10 Best Cold Weather Thermal 2025 in the United States

The Thermajohn Long Johns Thermal Underwear set is designed to keep you warm in cold weather thanks to its fleece lining, which adds softness and insulation. Made from a blend of polyester and spandex, the fabric offers a good balance of stretch and durability, helping you move freely without feeling restricted or uncomfortable. Weighing just over 14 ounces, it’s light enough to wear under other clothing layers without adding bulk.

The material also has moisture-wicking properties that help keep sweat away from your skin, maintaining dryness during physical activities or daily wear. Breathability is addressed through the fabric’s construction, which means you won’t feel overly hot or sweaty when active. The fit appears to be snug and supportive, suitable for layering under winter clothes or even as cozy pajamas at home.

This thermal set presents a solid option for men looking for everyday cold-weather underwear that combines warmth, flexibility, and moisture management, though those needing specialized odor control or heavier insulation might want to explore additional options.

The Cuddl Duds Thermal Underwear set for women is designed to keep you warm and comfortable in cold weather thanks to its brushed fleece lining and heavyweight fabric. It’s made from a blend of polyester and spandex, which offers a good stretch for easy movement and a snug, flattering fit. The moisture-wicking fabric helps manage sweat by absorbing and evaporating it, which is great for staying dry during activities in chilly conditions. A nice bonus is the built-in protection from UV rays, making this set useful for outdoor use in winter sun.

The design includes thoughtful features like thumbholes and a tag-free label for added comfort throughout the day. The weight strikes a balance between warmth and avoiding bulk, so it can be worn alone or layered under outerwear. This set suits women who want a cozy, flexible thermal base layer for casual or active winter wear.

For those needing heavy-duty performance or advanced odor control, other options might be more suitable.

The Cuddl Duds Thermal Underwear set for women is designed to keep you warm and comfortable in cold weather. Its brushed fleece lining inside provides good insulation without adding bulk, making it a great option for layering or wearing alone at home or on the go. The fabric is mostly polyester with some spandex, offering a stretchy fit that moves with you and includes thumbholes and a modern rise for added comfort and coverage.

Moisture-wicking is a strong point here, helping to pull sweat away from the skin to keep you dry, which is important during active winter days. The fabric also blocks 50+ UV rays, adding an unexpected layer of protection. Because the main fabric is polyester, breathability might be average—meaning it may trap some heat if you’re very active or in milder temperatures. Durability should be decent with proper care.

Weighing about 15 ounces, the set strikes a balance between warmth and lightness. This thermal underwear is a solid choice for anyone looking for cozy, stretchy, and moisture-managing base layers in cold weather, especially if you value comfort and a snug fit.