The updated the fit of Smartwool's Men's Classic Thermal Merino Base Layer 1/4 Zip improves functionality while also enhancing aesthetics. As one of their 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.

Details

Fit: Slim
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
Size medium center-front zipper: 10" (25 cm)