Size Chart These new and improved run socks feature Smartwool's 4 Degree(TM) elite fit system, Indestructawool(R) technology for superior durability and a virtually seamless toe. Men's-specific mesh ventilation zones provide ultimate temperature and moisture regulation where male runners need it most. A low cut height provides that ideal balance of protection and style. 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 - Minimal cushioning for maximum performance in close-fitting shoes - Sock Height: Low Cut - Virtually Seamless(TM) toe for enhanced comfort - 2.25" overall height - Made in USA of Imported Yarns: 48% Merino Wool, 48% Nylon, 4% Elastane - Last Chance: Discontinued Style - Only available to ship within the USA