Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip Boxed 2025

Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip Boxed 2025

We've updated the fit of our Men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of our heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature-regulated as you enjoy high-intensity skiing, hiking, running, and more.

• Slim
• Our slim fit is intended to follow the contours of the body
• Fabric helps combine the moisture management, temperature regulation, and odor resistance of 100% Merino wool with interlock knit for comfort
• Flatlock seam construction and offset shoulder and side seams designed to help increase comfort and minimize chafing
• Side seams wrap to front
• 10" (25 cm) center-front zipper
• Made in Vietnam: 100% Merino Wool. Exclusive of Decoration.
• SW002822