We have revised the fit of our Women's Classic Thermal Merino Base Layer 1/4 Zip to enhance functionality while also improving aesthetics. This garment is one of our heaviest base layer tops and the best base layer for cold weather. It is made from 100% responsibly sourced merino wool, features shoulder inserts, and has a flatlock seam construction that minimizes chafing, ensuring you feel comfortable while skiing, hiking, running, and engaging in other activities while regulating your temperature.