Men's Base Layers & Thermal Underwear

Men's base layers for essential warmth

Decathlon’s base layers for men are engineered to deliver superior warmth and comfort throughout the winter. Made to be worn close to the skin, these technical undies offer the perfect blend of softness and protection for all your outdoor adventures, just like our women's base layers. Our men's merino wool layers are especially effective at managing moisture.

A wide variety of men's thermal underwear

Explore Decathlon base layer bottoms and tops for complete coverage and warmth. With a range of sizes and styles available, our men's thermal underwear suits every need. These layers provide a snug fit that ensures unrestricted movement. It’s an excellent choice for staying warm and comfortable during outdoor activities, especially when paired with fleece jackets. 

How to find the perfect men's base layer

Crafted from high-quality materials, our men’s base layers include flat seams to reduce chafing, ventilation zones for improved breathability, and an ergonomic design for enhanced comfort and mobility. Explore our full range of base layers to find the perfect fit.

Caring for your thermal underwear

Our men's thermal underwear is not only built for performance but also for easy care. Decathlon underwear are machine washable and retain their shape and durability, ideal for active or travel-focused lifestyles. Proper care for merino wool helps maintain your base layer’s ability to wick moisture effectively.

Discover the warmest men's base layers

For ultimate protection in extreme cold, our men's base layers are made from top materials like merino wool or synthetic fibers. These fabrics offer excellent thermal insulation, comfort, and resistance to odors, making them a reliable winter choice, especially when paired with our base layer leggings.