Merino Wool Base Layers

Explore base layers designed by Smartwool® to help regulate temperature, manage moisture, and provide breathable comfort in any condition. Our collection of Merino wool base layers is built for comfort and performance, whether you're hitting the slopes, hiking in cold weather, or layering for everyday wear.

Our base layers are made from the finest Merino wool, known for its natural breathability and soft, next-to-skin feel. These layers help regulate your body temperature, keeping you comfortable across changing conditions, making them ideal for year-round use. Choose from all-season and thermal base layers designed for different activities and environments.

From men’s and women’s base layers to styles for kids, our collection is designed to fit all bodies and all activities. Whether you need a close-to-body fit for high-intensity movement or a more relaxed feel for everyday comfort, our base layers are made to move with you.

Each piece in our collection is carefully crafted to help regulate temperature, manage moisture, and resist odors, keeping you comfortable throughout your day. Plus, with Smartwool’s commitment to sustainability and responsible sourcing, you can feel good about your gear.

Want to shop locally? Smartwool products are available at over 5,000 stores across the U.S. Use our Store Locator tool to find a location near you.

Merino Wool Base Layer FAQs

Q: What is the difference between Smartwool's lightweight and midweight base layers?

A: Our lightweight base layers, such as the Merino 150, are designed for warmer conditions like spring skiing or high-energy activities such as cross- country skiing, providing breathability and moisture management. Midweight options like the Merino 250 offer more insulation and are better suited for colder environments like winter skiing or slower-paced activities like winter hiking.

Q: Can I wear Smartwool base layers as standalone tops?

A: Absolutely! Many of our base layers are designed to be worn on their own. Their versatile stylish cuts, breathability and moisture management make them perfect for everyday wear and casual activities

Q: Are Smartwool base layers bulky when worn under other gear?

A: No, our base layers are designed to be thin and lightweight, ensuring they fit comfortably under other layers without adding unnecessary bulk. This allows you to move freely while staying warm and comfortable.