CAcB Women's Ultra Thin Cool No Show Footie Liner Socks Womens one size but comfortable fits US size 5.5-9 Non-slip,silicone heel grips.Non-skid,silicone patches under the fore foot. Ultra thin, hidden lowcut boat line, Liner sock, Non-slip, No-show socks. Color: Black ,Nude(Skin),Dark Nude Foot liner, Seamless.