FITS Light Ski Tech OTC Women Vented instep and top for minimal bulk Color-Replacementd seam on toe so you won't forget your size Made in the USA Materials: 64% Ultra Spun polyester, 36% Nylon, 2% Lycra spandex Sizing: Small: Men's 3.5-5.5, Women's 5-7. Medium: Men's 6-8, Women's 7.5-9.5. Large: Men's 8.5-10, Women's 10-11.5. X-Large: Men's 10.5-12.5, Women's 12-14. XX-Large: Men's 13-15.5, Women's 14.5-16.5.