NTS Midweight 250 Pattern Zip Top can be used as a single layer in cool temps or as a baselayer when you are out exploring in the extreme cold. Flatlock seams allow for minimal chafage and the form fit makes layering a piece of cake. And don't worry about overheating, the 100% Merino wool is great at wicking away extra moisture. It does all this and even has stripes.
100% Merino Wool
Fabric Weight - 250 gm / m² (7.4 oz / yd²)
Form Fit - Smartwool's slimmest fit. Follows the contours of the body
Interlock knit; UPF 50+
Shoulder panels eliminate top shoulder seams
Flatlock Seam Construction - Designed to eliminate chafing