FITS Light Trail Quarter Sock - Men's 40% nylon Ultra Light Trail top rises between Quarter and Crew height Color-Replacementd seam on toe so you won't forget your size Made in the USA Materials: 50% Merino Wool, 40% Nylon, 7% Polyester, 3% 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.