Smartwool PhD® Ski Medium Socks Dont let the cold stop you from taking one last run: the PhD® Ski medium delivers maximum warmth and breathability when the going gets cold. Patent-pending Indestructawool technology provides ultimate durability to make sure your socks are ready to go, run after run. Made with our 4Degree® elite fit system for a sock that doesnt bunch, slip, or bind. Features: Sock Height: Over the Calf Body-mapped mesh zones for added breathability Virtually Seamless toe for enhanced comfort 14" overall height Made in USA of Imported Yarn: 62% Merino Wool, 36% Nylon, 2% Elastane Care: Machine Wash Warm, Wash Inside Out. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.