Size Chart For the lady shredder who wants the minimum between foot and boot, the PhD(R) ski ultra light offers the benefits of Merino in a high-performance fit. Featuring Indestructawool(TM) technology for long-lasting wear, 4 Degree(TM) elite fit system, mesh ventilation zones, and Smartwool's signature Virtually Seamless(TM) toe for ultimate comfort in a ski boot. A women's-specific fit offers a narrower heel and overall slimmer fit. Features: - Women's specific fit - 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 - Mesh ventilation zones provide optimum moisture management and maximum breathability - Non-cushioned sole and leg for a close fit in tight-fitting performance boots - Sock Height: Over the Calf - 200 needle construction provides highest knit density while maintaining ultra light weight - Virtually Seamless toe - 13" overall height - Made in USA of Imported Yarn: 55% Merino Wool, 42% Nylon, 3% Elastane - Last Chance: Discontinued Style - Only available to ship within the USA