NEW FOR FALL 2012, PhD Outdoor Medium Crew sock with patent pending ReliaWool Technology. Also features 4-Degree Fit System, keeping the sock in place and giving you all-sport versatility. Flat knit durable toe seam for high burst strength. 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)