Smartwool Men's Classic Thermal Merino Base Layer Bottom

Warmth Without Bulk for Cold-Weather Layers

Best For: Skiing, winter hiking, cold-weather running and everyday layering when dependable warmth matters.

Merino wool warmth. Made from 100% Merino wool, these thermal base layer bottoms provide breathable warmth while helping manage moisture and odour. The soft interlock knit delivers comfortable coverage when temperatures drop.

A close layering fit. The slim cut sits close to your body without adding unnecessary bulk, making these bottoms a practical foundation beneath ski pants, hiking trousers or everyday winter layers. Flatlock seams help reduce rubbing when you're moving for hours.

Details that matter. A Merino-lined elastic waistband adds next-to-skin comfort, while the functional fly keeps things practical. From cold trail outings to long days on the mountain, this warmest-weight Merino layer is built for time spent outside.

Features & Benefits

• 100% Merino wool: Provides breathable warmth while helping regulate moisture and resist odour.
• Warm interlock knit: Delivers soft, substantial comfort for cold-weather layering.
• Slim fit: Sits close to the body to layer efficiently beneath outerwear.
• Flatlock seams: Help reduce friction and chafing during extended wear.
• Comfort-focused details: A Merino-lined elastic waistband and functional fly add everyday practicality.