Organic Cotton Sock with Non-Slip, Cushioned Reinforced Sole. * Great for Low-Impact Exercises such as Yoga or Pilates, or Simply Lounging with the Safety of a Non-Slip Sock! * Sizing: Small = Women"s 4-6, Medium = Women"s 6.5-9.5 & Men"s 5-8.5, Large = Women"s 10-13 & Men"s 9-12.5 * Great Hygienic Solution for Travel! Wear in the Plane, the Hotel, Train or Automobile! Keep Germs Away! * The Original TractionSocks!