Women"s sock sizes Small (shoe size 4-6.5) Medium (shoe size 7-9.5) Large (shoe size 10-12.5) NOTE Women"s size Small fits Youth shoe size 2-4.5) * Crew height, cushioned. Supportive arch brace, virtually seamless toe. 76% merino wool, 21% nylon, 3% elastane. Washer and dryer friendly!