10 Best Thermals For Women 2025 in the United States

The Cuddl Duds Thermal Underwear for Women is a comfortable and practical option for cold weather. Made with 93% polyester and 7% spandex, the material is designed to be both warm and stretchy. The brushed fleece lining adds an extra layer of warmth, making it ideal for chilly conditions. The moisture-wicking fabric helps keep you dry by absorbing and evaporating moisture, which is a valuable feature for active wear or extended use. Additionally, the odor resistance feature ensures you stay fresh even after prolonged wear.

The spandex stretch provides a snug fit, which is complemented by the thumbhole sleeve top and modern rise leggings for a streamlined look. The set also offers 50+ UV protection, making it useful for outdoor activities. The seam construction is designed to be durable and comfortable, minimizing chafing and irritation.

However, the heavyweight nature of the fabric means it might not be suitable for milder climates or indoor activities where lighter thermals would be preferable. The bulkiness could also be a downside for those looking for a more discreet base layer. This thermal set is best suited for women looking for robust cold-weather protection, whether for outdoor adventures or simply staying cozy indoors.

The Fruit of the Loom Women's Micro Waffle Premium Thermal Set is designed to keep you warm in cold to moderately cold conditions. The set includes a long sleeve crew-neck t-shirt and leggings made from a blend of 80% polyester and 20% cotton. This combination of materials offers some key advantages. The fabric is soft and stretches well, ensuring a comfortable and better fit, while being versatile for various body shapes.

The use of micro waffle fabric helps in retaining heat, which is great for staying warm during chilly weather. Additionally, the tag-free label adds to the comfort by preventing irritation around the neck area. Another practical feature is that it is machine washable, making it easy to care for.

This thermal set is a good choice for those looking for an affordable and comfortable option for moderately cold weather.

The Merino.tech Merino Wool Base Layer for Women stands out due to its high-quality material, being made from 100% superfine 17.5-micron Merino wool. This ensures a soft, comfortable wear that's itch-free and suitable for daily use. Offering a midweight option with a 250 g/m² fabric weight, it strikes a balance between warmth and breathability, making it versatile for various weather conditions. The package also includes Merino wool socks, adding value to the purchase.

The material is excellent at moisture-wicking and odor resistance, keeping you dry and fresh, which is ideal for active wear or extended use. It's also easy to care for, being machine washable, although hand washing and air drying are recommended for longevity. The pull-on closure adds to its simplicity and ease of use.

This thermal base layer is perfect for those seeking comfort and quality in cold weather apparel, particularly useful for hiking or other outdoor activities.