10 Best Base Layer Women 2025 in the United States

The Thermajane Long Johns Thermal Underwear is designed to be a cozy and effective base layer for women, especially suitable for cold weather. One of its strongest features is the heat retention capability, ensuring you stay warm by preventing body heat from escaping. The fleece lining enhances comfort, making these long johns feel ultra soft against the skin, which is a major plus for all-day wear.

When it comes to moisture-wicking, these thermals excel in keeping you dry and odor-free, making them a good choice for both lounging at home and engaging in various activities. The four-way stretch fabric allows for flexibility, ensuring that you can move freely without any restriction.

The material composition—a blend of 92% polyester and 8% spandex—might not appeal to those who prefer natural fibers. Some users may find the fit snug, which could be uncomfortable for those who favor looser clothing. Additionally, while the product is machine washable, the care instructions may require some attention to maintain its quality over time.

The Cuddl Duds Thermal Underwear for Women is designed to keep you warm in cold weather with its fleece-lined interior and heavyweight fabric. The set includes a thermal shirt top and leggings, both made from 93% polyester and 7% spandex, providing a snug yet comfortable fit thanks to its spandex stretch. This fabric blend ensures that the material is stretchy and durable while also offering protection against harmful UV rays with a 50+ UV rating.

The moisture-wicking properties help to absorb and evaporate sweat, which is essential for staying dry and comfortable during outdoor activities or layering under other clothing. The design includes thoughtful features such as thumbhole sleeves, modern rise leggings, and a tag-free label, enhancing comfort and usability.

This thermal set is machine washable, which adds convenience for regular use. Ideal for anyone needing a reliable, warm base layer for winter activities or lounging, this set combines style, functionality, and comfort effectively.

The Under Armour Women's Authentics Long Sleeves Crew Neck T-Shirt stands out with its dual-layer fabric, combining a warm, brushed interior with a smooth, fast-drying exterior. This makes it an excellent choice for those needing a base layer that keeps you warm while also dealing efficiently with sweat. The material's moisture-wicking properties ensure that you stay dry, which is a significant benefit for active wearers. Additionally, the mesh underarm panels provide extra ventilation, making it more comfortable during intense activities.

The raglan sleeves are designed to offer better movement and comfort, a thoughtful feature for active use. This shirt is made of 100% knit fabric, which provides a good balance of warmth and breathability. However, it's worth noting that while the fabric is designed to dry quickly, some users might find it a bit heavier at 1.4 pounds compared to other base layers. The T-shirt is machine washable, which adds to its convenience.

One potential downside is the lack of specific odor control features, which could be a concern for those engaged in prolonged physical activities. Given its design and material, this T-shirt is ideal for athletes or anyone engaging in outdoor activities who needs a reliable, warm, and moisture-wicking base layer. However, if odor control is a crucial factor for you, you might want to consider additional options or treatments.