Zip up in cold weather and zip down when it warms up in this year-round favorite, Smartwool's Men's Classic All-Season Merino Base Layer 1/4 Zip. This top uses their All-Season-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.Features: Slim fit is intended to follow the contours of the body Lightweight Merino jersey fabric uses a recycled nylon core to increase durability while still keeping 100% Merino wool next to skin Flatlock seam construction and offset shoulder and side seams designed to increase comfort and minimize chafing Side seams wrap to front for body-enhancing fit Weight: 0.184 kgs Fit: Slim Country of Manufacture: China Composition: 88% Merino Wool, 12% Nylon. Exclusive of Decoration.Care Instructions: Do Not Bleach Do Not Use Fabric Softener Do Not Dry Clean Tumble Dry Low Cool Iron As Needed Do Not Iron Decoration Machine Wash Warm Gentle Cycle 30 Degrees Non-Bio Detergent Wash With Like Colours Smartwool Men's Merino 150 Baselayer Quarter Zip Top Black 001 SW000753