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We took our popular Classic All-Season Merino Base Layer and added a 1/4 zip to it—making it the perfect base layer for warm or cold weather. This top uses our lightest-weight Merino fabric wrapped around a nylon core to increase durability, while still keeping the 100% soft, Merino wool you love next to skin. Side seams help minimize chafing while wearing a pack and offer a body-enhancing fit. Select colorways feature a more responsible plant based dye technique. This base layer is comfortable, powerful, sustainable, and, frankly, do-it-all-able.
Smartwool's lightest weight Merino jersey fabric uses a nylon core to increase durability while still keeping 100% Merino wool next to skin
Offset shoulder and side seams designed to increase comfort and minimize chafing while wearing a backpack
Side seams wrap to front for body-enhancing fit
Flatlock seam construction designed to minimize chafing
8" (20 cm) center front zip with semi-locking slider
Knit in China: 87% Merino Wool, 13% Nylon. Exclusive of Decoration.