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The Smartwool Men’s Classic Thermal Merino Base Layer 1/4 Zip has been updated with a refined fit for improved functionality and aesthetics. As one of Smartwool’s heaviest base layer tops, it’s designed for cold-weather performance. Made from 100% responsibly sourced Merino wool, this garment offers natural sweat management, odor resistance, and temperature regulation. Shoulder panels and flatlock seam construction minimize chafing, while the quarter-zip design adds versatility for skiing, hiking, running, and more.
Because you want warmth, comfort, and performance in cold conditions. The Smartwool Men’s Classic Thermal Merino Base Layer 1/4 Zip 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 all your winter adventures.


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