10 Best Thermals 2025 in the United States

The Thermajohn Long Johns Thermal Underwear for Men is a solid choice for those needing warmth and comfort during cold weather. One of its key strengths is the heat retention feature, which keeps you protected from chilly conditions, making these long johns ideal for outdoor activities or lounging at home. The ultra-soft fleece lining enhances comfort, allowing you to wear them all day without irritation. With moisture-wicking properties, they effectively pull sweat away from your body, helping you stay dry even during physical activities.

The 4-way stretch material provides great flexibility, ensuring that you can move freely without bunching or chafing, which is a big plus for anyone who's active. Additionally, their compatibility with layering makes them an excellent base layer for winter outfits.

On the flip side, while the polyester and spandex blend offers decent durability, some users may find that over time, the material could wear out or lose its shape. The fit may also vary based on personal preference, as some might prefer a looser or tighter feel. Lastly, being machine washable is convenient, but care should be taken to maintain the fabric quality over time.

The Amazon Essentials Thermal Long Johns Underwear Set for Men is made from a blend of 60% cotton and 40% polyester, providing a balance of softness and breathability. The slim fit design ensures it contours well to the body through the shoulders, chest, waist, hips, and thighs, making it suitable for wearing beneath other layers. This set is lightweight, offering warmth without added bulk, making it ideal for cold weather conditions.

The waffle knit texture enhances breathability, which can aid in comfort over prolonged wear. However, being a cotton-poly blend, it may not wick moisture as efficiently as some high-performance synthetics, which could affect comfort during intense activities. The elastic waist and rib cuffs ensure a snug fit, enhancing comfort.

Durability-wise, the product is designed to withstand everyday wear, which is supported by the positive reputation of the Amazon Essentials brand. Weighing only 8 ounces, it is light and easy to care for with machine wash and tumble dry instructions. For those looking for affordable, everyday thermal wear, this set is a strong contender, although those requiring advanced moisture management might find it lacking.

The WEERTI Thermal Underwear for Women is designed to provide warmth and comfort during cold weather. Made of 92% Microfiber and 8% Spandex, the material offers a good balance of softness and flexibility. The lightweight fabric ensures that it can be comfortably worn under various layers of clothing without adding bulk. Its moisture-wicking properties are particularly strong, effectively keeping you dry and comfortable by transporting sweat away from the skin quickly.

The four-way stretch fabric ensures freedom of movement, making it ideal for activities that require flexibility. The snug fit design prevents bunching and heat loss, enhancing its effectiveness as a base layer. However, while the fit is designed to be like a second skin, this may not suit everyone, particularly those who prefer a looser fit.

Durability might be a concern since the fabric blend, although comfortable, may not be as long-lasting as some higher-end options. Additionally, as it is imported from China, there might be variability in quality. Maintenance is easy with machine wash instructions. This thermal set is best suited for women looking for a comfortable, moisture-wicking base layer that can be worn throughout the day, whether under formal attire, casual wear, or as pajamas.