10 Best Thermal Ski Underwear 2026 in the United States

The WEERTI Thermal Underwear for Men is a solid choice for anyone needing warm and comfortable base layers in cold weather, including skiing or other outdoor winter activities. Made from a blend of polyester and spandex, it offers a soft fleece lining that feels gentle on the skin and keeps warmth locked in all day. The material is lightweight yet designed to be breathable, so it can wick away moisture and help keep you dry, which is important when you’re active and sweating.

The four-way stretch fabric provides a flexible fit without restriction or annoying bunching, allowing you to move freely whether you’re layering it under ski pants or wearing it alone as sleepwear. It also has odor-controlling properties, which is a nice bonus if you’re wearing it for extended periods. Since the fabric is mostly synthetic, it might not be as breathable as natural fibers like wool for very intense activities or in milder conditions.

This thermal set is practical and versatile, particularly suited for men looking for warmth, comfort, and easy care on cold days.

The Merino.tech Merino Wool Base Layer Men's Set is crafted from 100% merino wool, known for its softness and comfort. The material ensures an itch-free experience, which is crucial for all-day wear. The set includes a top and bottom with a midweight fabric at 250 g/m², making it versatile for various weather conditions. It includes a bonus pair of Merino Wool Hiking Socks, adding value to the purchase.

The product's moisture-wicking capabilities are noteworthy, keeping the wearer dry by absorbing moisture efficiently, which is vital for active or outdoor activities. Additionally, its natural odor-resistant properties help maintain freshness over extended wear periods. Breathability is another strong suit, as merino wool naturally regulates body temperature, enhancing comfort across different climates and activities.

The product's care instructions suggest hand washing and air drying for longevity, though it is listed as machine-washable, which adds convenience. A potential drawback could be the price, as merino wool products tend to be on the higher side, but the added features and sock bonus may justify the cost for many users. The midweight option at 250 g/m² is a balanced choice for most users, but those in extremely cold or warm environments might need to consider the heavier or lighter variants available. The packaging and presentation make it a suitable gift option. This set is ideal for men seeking high-quality, comfortable thermal underwear for daily use or outdoor activities, with the added benefits of moisture control and odor resistance.

The Cuddl Duds Thermal Underwear for Men offers a warm and comfortable base layer option for cold weather, especially suitable if you're skiing or spending time outdoors in low temperatures. It features a brushed fleece lining inside that provides cozy insulation without feeling overly bulky. The fabric is mostly polyester with some spandex, making the set stretchy and snug to the body, which helps with movement and layering under ski gear.

Moisture-wicking is a strong point here, as the material helps pull sweat away from the skin to keep you dry, an important factor when active in the cold. It also offers good protection against UV rays, which is a nice bonus if you’re on snowy slopes exposed to sunlight. The design includes thoughtful details like thumbholes in the sleeves and a functional fly, adding to comfort and usability throughout the day.

This thermal set provides reliable warmth and stretchiness, along with added UV protection, making it a solid choice for cold weather base layering during outdoor activities.