This timeless classic is made from 320gm pure merino Jersey, a very soft, breathable, warm fabric that resists pilling, fights odor naturally, and looks great in every environment. The Original Long Sleeve Half Zip makes a great midlayer for skiing, a warm but breathable top for hikes in cool to cold weather, or a refined top for adventures in the city. Fabric weight: 320 Heavyweight, Fabric: 100% Merino Wool, Product Weight: Medium = 366 g / 12.91 oz Care: Machine wash with similar colors. Do not use softeners, do not use bleach. Dries fast in the shade, do not tumble dry. Do not dry clean. Exact instructions on the care label.