10 Best Long Underwear For Cold Weather 2025 in the United States

The Thermajohn Long Johns Thermal Underwear set is a solid choice for anyone looking to stay warm during cold weather. One of its standout features is the ultra-soft fleece lining, which enhances comfort and provides excellent heat retention, making it great for outdoor activities or lounging at home. The breathable fabric effectively wicks away moisture, which is essential for keeping you dry and comfortable, especially if you're active or wearing them for extended periods. The 4-way stretch also allows for freedom of movement, so you won't feel restricted or uncomfortable while wearing them.

The material is primarily polyester, which may not be as durable as some higher-end fabrics. While the moisture-wicking capability is a strong point, the synthetic material can retain odors over time, requiring more frequent washing. Additionally, the sizing might be on the snug side for some, so it's advisable to consider sizing up if you prefer a looser fit.

These long johns are best suited for individuals who need effective thermal underwear for cold weather conditions, whether for outdoor sports or as loungewear. They deliver good warmth and comfort, but users should be mindful of potential odor retention and check sizing before purchasing.

The Cuddl Duds Thermal Underwear for Women is designed to keep you warm in cold weather with its brushed fleece lining and matte soft exterior. The heavy-weight material ensures good insulation, while the moisture-wicking fabric helps in keeping you dry by absorbing and evaporating sweat. The inclusion of spandex provides a comfortable stretch, ensuring a snug fit without restricting movement.

The set includes a top with thumbholes and modern rise leggings, both of which are designed to offer head-to-toe protection against the cold. Additionally, the fabric offers 50+ UV protection, making it a practical choice for outdoor activities. The design is sleek and versatile, allowing it to be worn as a base layer or on its own.

However, the thermal set might feel a bit bulky for some users who prefer ultra-lightweight options. Its durability is promising, thanks to the densely knit fabric, but long-term wear and tear are still to be tested. The material blend of 93% polyester and 7% spandex makes it easy to care for with a simple machine wash. This thermal set is ideal for women looking for effective cold-weather gear that combines comfort, warmth, and versatility.

The WEERTI Thermal Underwear for Women is designed with cold weather in mind and offers several notable strengths. The material is a blend of 92% soft polyester and 8% spandex with a fleece lining, providing a good balance of warmth and comfort. The fabric's ability to wick moisture effectively ensures you stay dry, making it suitable for various activities. The four-way stretch feature adds flexibility and ensures a snug fit, enhancing comfort without restricting movement.

This makes it ideal for layering under other clothing, whether for outdoor activities or casual wear. The snug fit also helps minimize heat loss, which is a definite plus for maintaining warmth in cold climates. Durability seems promising due to the quality materials used. Machine washability adds convenience, making it easy to care for.

This thermal set is versatile enough to be worn as a base layer, casual wear, or even pajamas. It strikes a good balance between performance and comfort, making it a reliable choice for winter wardrobes.