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100% Merino. 100% capable. The Smartwool Women’s Classic Thermal Merino Base Layer Bottom is always ready for what’s ahead. With an updated fit designed to improve functionality and aesthetics across a range of body shapes, plus flatlock seam construction to minimize chafing, comfort is never in question. Add one of Smartwool’s best base layer pants to your winter wardrobe and conquer the cold with confidence.
Because you want warmth, comfort, and performance in cold conditions. The Smartwool Women’s Classic Thermal Merino Base Layer Bottom combines the natural benefits of Merino wool with a slim fit, flatlock seams, and breathable midweight fabric—making it the perfect choice for skiing, hiking, running, and everyday winter adventures.


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