The Smartwool Classic Thermal Merino Base Layer 1/4 Zip Top is a staple in the base layer world. Constructed of 100% merino wool for enhanced comfort, breathability, and odor resistance. Exactly what you need for hitting the hill day after day.

• Slim Fit
• Flatlock seam construction designed to minimize chafing
• Shoulder panels eliminate top shoulder seams
• 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance