Designed in collaboration with American Ballet Theater Principals Irina Dvorovenko and Maxim Beloserkovsky. Bloch iconic booties keep dance feet warm without the need to remove your ballet shoes. Softly padded with cushioned heel, Bloch iconic booties offer extra comfort, protection and longevity to ballet shoes. Velcro strap fastening for a secure fit. Sizing suggestion: Small (for U.S. Child's shoe sizes 10 - 11.5, EU size: 28-31), Medium (for U.S. Child's shoe sizes 12 - 13.5, EU size: 32-34), Large (for U.S. Child's shoe sizes 1 - 2.5, EU size: 35-36), X-Large (for U.S. Child's shoe sizes 3 - 4.5, EU size: 35.5-37). Material: Polyester, Nylon.