InvisaSock sock liners are essential for every occasion from casual to work. The stay-put gel tab provides an anti-slip design, for true invisible comfort. You may even forget you have them on! With a sock that works for nearly every shoe in your closet, there is finally no need to sacrifice fashion for comfort. - All day non-slip gel tab provides stay-put, all day wear - Feet stay cool & dry by absorbing moisture - Stretch fabric helps prevent foot blisters, cracked heels, germs & odors - Out of sight liner stretches comfortably over toes & around heel - The hourglass shape conforms to the shape of the foot - Wear with a wide variety of shoe styles: Sneakers, High Heels, Boat & Deck Shoes, Pumps, Slip-Ons, D'Orsay, Flats, Ballet, Dance, Booties, Jelly Bean Sandals, Loafers, Wedges, Espadrilles, Moccasins, Oxfords, Monks, Mary Janes - Patent Pending Ladies Sizing Small: Shoe Size 6-7 Medium: Shoe Size 7.5-8.5 Large: Shoe Size 9-10 X-Large: Shoe Size 11-12