The Smartwool Men's Classic Thermal Merino 1/4 Zip Base Layer combines functionality with enhanced aesthetics in a slim fit design. Made from 100% responsibly sourced Merino wool, this heavy base layer top features flatlock seams and shoulder panels to minimize chafing and maximize comfort during high-intensity activities like skiing, hiking, and running. Its interlock knit fabric ensures excellent breathability, thermoregulation, and odor resistance, while the 10" center front zipper with a semi-locking slider provides adjustable ventilation.

• Slim Fit
• 100% Merino Wool.
• 10' (25 cm) center front zipper semi-locking slider
• Flatlock seam construction designed to minimize chafing
• Shoulder panels eliminate top shoulder seams
• Fit updated to improve functionality while enhancing aesthetics
• 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance

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