Smartwool Kid's Hiking Light Crew, Grasshopper size L 50% Merino Wool, 48% Nylon, 2% Elastane 3x1 rib leg and elasticized arch, flat knit toe seam and side panel, choose color light half-cushioned foot, crew height rises 6-8 inches above ankle 69% wool, 25% nylon, 6% spandex, machine wash, tumble dry Kid's Size XS=shoe size 6-8.5, S-shoe size 9-11.5, M=shoe size 12-2.5, L=shoe size 3-18 Washer and Dryer friendly