Smartwool Men's Classic Thermal Merino Base Layer Bottom X-Large Black

Natural Warmth from 100% Merino Wool
Engineered with 100% Merino wool, this bottom offers natural moisture-wicking, odor resistance, and temperature regulation to keep you dry and warm in cold weather. The soft interlock knit adds breathability and next-to-skin comfort, making it one of the best options in merino wool thermal pants for cold-weather layering and outdoor performance.

Updated Fit for Active Movement
Designed with a slim fit, this layer features a refined silhouette that enhances mobility. The flatlock seam construction helps prevent chafing during movement, while the merino-covered elastic waistband provides a secure yet comfortable feel. A traditional fly design adds functionality to this modern performance piece, perfect for athletes and outdoor explorers.

Performance Built into Every Detail
Ideal for skiing, hiking, or cold-weather workouts, these Smartwool base layer bottoms combine warmth and technical construction. Whether worn under snow gear or as a standalone base layer, the breathable knit and natural properties of wool support long-lasting wear. It's a go-to among men's wool thermal bottoms for winter sport and travel.