10 Best Thermal Ski Underwear 2025 in the United States

The Thermajohn Long Johns Thermal Underwear for Men are designed to keep you warm and comfortable in cold weather. Made from a blend of 92% polyester and 8% spandex, this set features an ultra-soft fleece lining that ensures a comfortable fit throughout the day.

The material is lightweight yet effective in heat retention, making it suitable for layering under other clothing or wearing as pajamas. One of its notable strengths is the moisture-wicking capability, which helps keep you dry by effectively managing perspiration.

Additionally, the 4-way stretch fabric allows for freedom of movement without chafing or bunching, making it ideal for active use in cold conditions. This thermal underwear set is best suited for those looking for a comfortable, warm base layer for cold weather, particularly for everyday wear or light activities.

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 Merino.tech Merino Wool Base Layer Women Set is a solid option for thermal ski underwear, particularly for those who prioritize comfort and performance in cold weather. The set includes a midweight top and bottom, made from 100% superfine 17.5 micron merino wool, which is renowned for its softness and comfort. The material is effective at regulating body temperature, making it suitable for a range of activities and conditions without causing overheating or discomfort.

Its natural moisture-wicking and odor-resistant properties help in keeping you dry and fresh during extended wear, which is valuable for skiing and other outdoor winter activities. The breathability of the material further enhances comfort by allowing heat to escape, preventing the buildup of sweat and moisture. However, the need for hand washing and air drying might be a drawback for some, as it requires extra care compared to more durable synthetic materials.

Additionally, while the product is designed for daily wear without rubbing or bunching, fit can be subjective and may vary from person to person. For those looking for a high-quality, comfortable, and functional thermal base layer, this Merino.tech set is an excellent choice, although the additional care requirements should be considered. The inclusion of a pair of merino wool hiking socks adds extra value to the package, making it a thoughtful gift for outdoor enthusiasts.