10 Best Thermals 2025 in the United States

The Amazon Essentials Thermal Long Johns for Men are designed to deliver lightweight warmth without feeling bulky, making them a good choice for cold weather layering. Made from a cotton-polyester blend (60% cotton, 40% polyester), they offer softness and breathability thanks to the waffle knit pattern, which helps with moisture-wicking but may not be as efficient as specialized synthetic fabrics. The slim fit design contours to the body, providing a snug feel around the shoulders, chest, hips, and thighs; this can enhance layering because it avoids excess bulk, but may feel tight for those who prefer looser garments.

The elastic waist and ribbed cuffs on the bottoms help keep the underwear in place during movement, contributing to comfort throughout the day. At just 8 ounces, the set is lightweight and suitable for wearing under other clothing without restriction. While the cotton content adds comfort, it can retain moisture longer than some advanced fabrics, so it might not be ideal for high-intensity activities where heavy sweating occurs.

Durability appears decent for everyday use, supported by Amazon Essentials' reputation for affordable yet reliable basics. Machine washable care makes maintenance easy. These thermals provide a solid budget-friendly option for men seeking comfortable, slim-fitting long johns for casual cold weather use and layering, though those needing high-performance moisture control or a looser fit might want to explore other 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 inside and a smooth, soft outer layer. Made mainly from polyester with some spandex, it offers a good stretch that allows easy movement and a snug fit without feeling tight, which is great for active days or lounging. The fabric is heavyweight and densely knit, providing decent warmth without bulk, making it suitable as a base layer under other clothes or worn alone for casual wear.

One strong point is its moisture-wicking ability, helping to pull sweat away from the skin and keep you dry, which is essential for staying warm. Additionally, it offers protection against UV rays, a bonus if you spend time outdoors in the winter sun. The set includes a top with thumbholes and leggings with a modern rise, designed to stay in place and provide full coverage. It’s also tag-free, adding to comfort. Weighing around 15 ounces, it is light enough not to feel heavy but still substantial for cold weather.

While the polyester fabric is durable and easy to care for with machine washing, it may not be as breathable as natural fibers like wool, which some might prefer for long outdoor use. Also, the fit might vary, so checking sizing is important for the best layering experience. This set is suitable for those looking for a warm, stretchy, and moisture-managing thermal base layer that performs well in everyday cold conditions.

The WEERTI Thermal Underwear for Men Long Johns are designed to provide excellent insulation and comfort during cold weather. Made from 92% polyester and 8% spandex, the material is both lightweight and stretchy, allowing for a snug fit that minimizes heat loss without restricting movement. This makes it suitable for layering under various types of clothing, from casual outfits to formal wear. The fleece lining adds an extra layer of warmth, ensuring you stay cozy in chilly conditions.

One of the key strengths of this thermal underwear is its moisture-wicking capability. The fabric efficiently wicks away sweat, keeping you dry and preventing that clammy feeling often associated with other thermal wear. This feature enhances comfort, especially during active use or long periods of wear. In terms of durability, the strong seams and 4-way stretch fabric ensure that the thermal underwear can withstand regular use without tearing or losing its shape.

However, because it is imported, availability might be an issue, and it may take some time to receive if ordered online. The fit is described as snug, akin to a second skin, which might not be preferred by those who like looser clothing. Additionally, while the polyester-spandex blend is good for moisture-wicking and flexibility, it might not be as breathable as some natural fibers like merino wool. This thermal underwear set is ideal for men seeking a reliable base layer for cold weather that offers warmth, moisture management, and flexibility, making it a good choice for winter sports, outdoor activities, or even just staying warm indoors.