10 Best Base Layer Women 2025 in the United States

The Cuddl Duds Thermal Underwear for Women offers a warm and comfortable base layer ideal for cold weather thanks to its brushed fleece lining inside and soft matte finish outside. The set includes a long-sleeve top with thumbholes and leggings with a modern rise, providing good coverage and comfort without feeling bulky. Made from a polyester and spandex blend, it offers stretchy movement, which helps when layering or wearing it alone.

Its fabric is moisture-wicking, meaning it helps pull sweat away from your skin to keep you dry, and it also features protection against UV rays, which is a nice bonus for outdoor use. The lightweight design (around 15 ounces) makes it convenient to wear under other clothing or on its own for lounging. The seams appear designed for comfort, and the tag-free label helps avoid irritation.

This set is a solid choice for women looking for a cozy, flexible base layer for winter activities or casual wear, but if you need heavy-duty odor control or natural fibers like merino wool, you might want to explore other options.

The Merino.tech Merino Wool Base Layer Women Set is made from 100% superfine merino wool, known for being soft and comfortable without causing itchiness, which is a big plus for daily wear. This set is heavyweight (320 g/m²), making it especially good for cold weather or outdoor activities like hiking. It naturally pulls moisture away from the skin and controls odor, helping you stay dry and fresh during extended wear. The fabric is breathable and regulates body temperature well, so it can work across different seasons.

The set includes a top, leggings, and a pair of hiking socks, which adds value. Care requires gentle washing and flat drying to keep the wool in good shape. The heavyweight material might feel too warm for milder climates or indoor use, and the delicate care instructions mean extra effort to maintain the garment. This base layer is ideal for women who spend a lot of time outdoors in cooler conditions and want natural, comfortable, and odor-resistant clothing. For those seeking a lightweight or less warm option, this particular heavyweight set may be too warm.

The Merino.tech Merino Wool Base Layer Set for women offers a reliable midweight option at 250 g/m², which is great for cooler weather activities like hiking or layering in winter. Made from 100% superfine 17.5 micron merino wool, it promises softness and comfort without the itchiness often associated with wool. This makes it suitable for wearing all day without discomfort.

It naturally wicks moisture away from the skin and resists odors, helping you stay dry and fresh during physical activity. The breathable fabric also helps regulate body temperature, so you won’t overheat or get too cold. The package includes a top, leggings, and a bonus pair of merino hiking socks, which adds value. Care instructions recommend hand washing or using a delicate cycle and flat drying, which might require more effort compared to synthetic base layers.

This base layer set is a solid, natural-fiber choice for women looking for comfort, odor control, and moisture management in a midweight layer, especially those who appreciate the softness of superfine merino wool and don’t mind the gentle care it requires.