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 Thermajane Long Johns Thermal Underwear for Women stands out in the thermal category, particularly for those seeking comfort and warmth in cold weather. One of its main strengths is the ultra-soft fleece lining, which provides a cozy feel against the skin, making it an appealing choice for lounging or layering under other clothing. The moisture-wicking feature is also commendable, as it helps keep you dry and odor-free, which is beneficial for both indoor and outdoor activities. Additionally, the heat retention capability ensures that your body warmth is maintained, making these long johns a solid option for everyday wear in chilly conditions.

Weighing in at a light material blend of 92% polyester and 8% spandex, the thermal underwear is designed to not only feel comfortable but also to fit well under clothing, providing good layering compatibility. It excels in comfort and moisture management, but potential users should consider its durability. Depending on washing and wearing habits, the lifespan may vary, so care instructions should be followed closely to maintain its quality.

Another aspect to keep in mind is sizing; while it is available in medium, those needing different sizes may find the options limited. The choice of color, olive green, might appeal to some users but may not suit everyone’s taste.

The Thermajane Long Johns are a great choice for women looking for a reliable base layer that offers warmth, comfort, and moisture control. However, potential buyers should be aware of the need for proper care and the limited size options.

The Fruit of the Loom Men's Recycled Premium Waffle Thermal Underwear Long Johns Bottoms are designed to provide insulation and warmth in cold to moderately cold conditions. Made from a blend of U.S. sourced cotton (52%) and recycled polyester (48%), these thermals are both eco-friendly and comfortable.

The soft mini waffle fabric ensures a cozy fit, and the reinforced flat seam construction adds to the durability, reducing the likelihood of wear and tear over time. These thermal pants are lightweight, making them ideal for wearing under other clothing layers without adding bulk.

The moisture-wicking and quick-drying fabric helps to keep you dry and comfortable, which is a significant advantage during physical activities or prolonged wear. These thermals are a solid choice for those looking for warm, moisture-wicking, and durable base layers, particularly for cold weather. They also appeal to the environmentally conscious due to the use of recycled materials.