Women's Base Layers & Thermal Underwear

The perfect women's base layer for cold weather

Looking for warmth without sacrificing comfort? Our women's base layer collection offers the ideal solution. Designed to keep you cozy during the coldest months, these base layers (including our popular base layer tops) provide comfort while ensuring optimal warmth throughout your day.

Women's thermal underwear for everyday activities

Our women's thermal underwear is crafted for versatility, making it perfect for daily wear and outdoor adventures. Whether you're heading to work, going for a hike, or simply running errands, these layers deliver reliable warmth and comfort. Easily pair them with fleece jackets for added insulation.

Base layers tailored to every shape

Our women's base layers are available in a range of sizes to suit every woman, ensuring a snug yet comfortable fit. With a sleek, adaptable design, these base layers seamlessly blend into any wardrobe. Explore our men's base layers for similar fits.

How to select your thermal underwear

When choosing your thermal underwear, consider your activity level and the warmth you need. Lightweight options are great for active pursuits. Thicker wool base layers offer additional insulation for colder days with minimal exertion. Pair with merino wool clothes to enhance your overall warmth.

Base layers high-quality materials 

Decathlon women's base layers are available in both merino wool and synthetic fabrics. Merino wool base layers naturally regulate body temperature and wick moisture, while synthetic layers, including fleece options, provide excellent warmth and insulation for winter.