Base Layers & Thermal Underwear

Essential base layers for warmth

A reliable base layer is crucial for staying warm during outdoor activities. Decathlon’s thermal underwear offers a snug fit, delivering optimal insulation while efficiently wicking away moisture. Our thermal underwear is an ideal first layer, helping you stay dry and comfortable in cold conditions.

Thermal underwear for cold weather

Our base layers, including merino wool and synthetic options, are designed with high-quality fabrics that prioritize comfort and functionality. Our thermal underwear includes flat seams to prevent chafing and strategically placed ventilation zones for breathability, making Decathlon thermal underwear perfect for winter sports or any cold-weather outings.

Selecting the right base layer

Whether you're drawn to the natural insulation of merino wool clothes or the fast-drying properties of synthetic materials, our collection of thermal underwear has something for everyone. Available in various sizes, our women's base layers and men's base layers offer a tailored fit that enhances movement and comfort.

Easy-care thermal underwear

Our base layers are not only functional but also easy to maintain, ideal for those who are always on the go. Decathlon’s thermal underwear can be machine-washed and dried flat, retaining shape and long-lasting durability even after frequent use.

How to layer clothes for outdoor activities

Layering is essential for maintaining the right body temperature in outdoor conditions. Start with a moisture-wicking base layer like thermal underwear, add an insulating layer for warmth (such as one of our fleece jackets), and finish with a weather-resistant outer layer to shield yourself from the elements.