Size Chart This all-mountain, lightly cushioned style comes fully equipped with Smartwool's 4 Degree elite fit system for a dialed fit, Indestructawool technology for ultimate durability and a Virtually Seamless toe. Light cushioning offers decent impact protection without being too bulky. Features: - PhD(R): Built for Performance in the Highest Degree - 4 Degree Elite Fit System: Uses two elastics for greater stretch and recovery to keep the sock in place - Indestructawool(TM) technology features a patent-pending construction method for exceptional durability and comfort - Light cushioned sole, shin and calf for impact absorption - Sock Height: Over the Calf - Virtually Seamless toe - 14" overall height - Made in USA of Imported Yarn: 57% Merino Wool, 41% Nylon, 2% Elastane - Only available to ship within the USA - Last Chance: Discontinued Style