10 Best Base Layer Women 2025 in the United States

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 Merino.tech Merino Wool Base Layer for women is a strong contender in the base layer category, particularly if you prioritize comfort and moisture management. Made from 100% superfine Merino wool, it offers a soft touch without the itchiness often associated with wool, making it suitable for all-day wear. The midweight fabric (250 g/m²) provides warmth without being overly bulky, which is perfect for various outdoor activities or layering in colder weather. One of the standout features is its moisture-wicking ability; Merino wool naturally absorbs sweat and allows it to evaporate, keeping you dry and fresh during strenuous activities. Additionally, its odor-resistant properties mean you can wear it for an extended time without worrying about unpleasant smells. The inclusion of wool socks adds value to the package, making it an attractive purchase for outdoor enthusiasts.

However, there are a few drawbacks to consider. While the fabric is durable and easy to care for with machine wash options, it may require more attention than synthetic materials, particularly if you want to maintain its longevity. Some users might also find the midweight option a bit heavy for more active pursuits in warmer climates. Lastly, while the product aims to cater to a broad audience, those with a strict budget may find the price point higher compared to synthetic alternatives. Despite these considerations, the Merino.tech base layer is well-suited for those who value performance and comfort in a base layer while enjoying the benefits of natural fabrics.

The Under Armour Women's Authentics Mock Neck T-Shirt is designed to perform well as a women's base layer, especially in cooler conditions. Made from 87% polyester and 13% elastane, the dual-layer fabric offers a combination of a warm, brushed interior and a smooth, fast-drying exterior. This material blend is effective at wicking moisture and drying quickly, which helps keep you comfortable during activity. The mesh underarm panels enhance ventilation, preventing overheating in key areas.

The mock neck design provides additional coverage and warmth, making it suitable for layering in cold weather. The fitted design strikes a balance between being snug and comfortable without feeling too tight or too loose, which can be ideal for layering under other clothing items. Raglan sleeves add to the comfort and range of motion.

At 1.4 pounds, it might be slightly heavier than some other base layers. The seams seem well-constructed. This t-shirt is a solid choice for those needing effective moisture-wicking and warmth in a stylish, fitted base layer.