Synthetic Rubber sole??WHAT SIZE SHOULD I BUY?All baby feet are different so please measure and compare with size chart(Description Page) before ordering And please choose the size by the sole length, NOT THE AGE. Insole Length= Foot lenght +Space(3/16-3/8in)??SANDALS FOR BABY 0-24MIncredibly comfortable and easy to wear, these girls' and boys' sandals are created with PU leather upper, rubber slip-resistant sole for both durablity and comfort. Flexible&Anti-Slip Rubber Sole for a Pleasurable and Comfort Walking Experience?EASY WEAR & STAY ONA Hook and Loop closure ensures our baby sandals easy to put on,take off and stay on your infants feet all day??FASHION & CASUAL DESIGNAdorable princess sandals with bow-knot on top/classic fisherman sandal design. Our baby sandals are suitable for formal occasion, party, casual, photography, outdoor activities, good for daily use??PARENTS' CHOICEWe offer 45+ Styles. It is ideal for babies who are just beginning to learn to walk. Super breathable soft sole brings maximum comfort to the baby's feet