Top:85% Nylon and 15% Spandex,Bottom:90% Cotton and 10% Nylon.The ultra socks are super soft and breathable which can keep your feet cool and dry all day. The socks with flower shape are used to strengthen anti slip and prevent slipping in shoes.Silicone gel circle to keep them firmly on your instep and heel grip. The no show socks are fully stretchy, neither too tight nor slack. Exudes a casual,invisible appearance when worn with shoes. Hidden Socks which are perfect for Low-cut, ballet shoes, pumps, high-heel shoes, sneakers, flat shoes, boat shoes, loafers, ect. Our comfortable socks are fully stretchy and fit for women with shoes size 5-8 and shoes size 9-11.