Size Chart Sometimes you just want a tall bike sock. A sock that fits well in your shoe, doesn't rub and helps keep your feet dry and comfortable on even the longest rides. The PhD(R) Cycle Ultra Light Crew checks all of those boxes plus features Indestructawool(TM) technology for ultimate durability. Features: - 4 Degree(TM) Elite Fit System for a dialed, performance-oriented fit with flex zone at ankle joint - Indestructawool(TM) technology features a patent-pending construction method for exceptional durability and comfort - Mesh ventilation zones provide optimum moisture management and maximum breathability - Non-cushioned for maximum performance in close-fitting cycling shoes - Sock Height: Crew - 8.5" overall height - Virtually Seamless(TM) toe for enhanced comfort - Made in USA of Imported Yarns: 46% Merino Wool, 49% Nylon, 5% Elastane - Last Chance: Discontinued Style - Only available to ship within the USA