Size: 13cm The front part opens wide, making it easy to put on and take off. Also, you can adjust the tightness, so it fits any foot! My child loved these, but their feet grew quickly and they outgrew them (lol). As a parent, I've started to think it's okay to buy used items and replace them frequently ^_^ I used them carefully, so the shape is mostly intact, and the Velcro sticks perfectly! I hope you'll use them! ^_^ Please note that this is a used item and there is some slight discoloration on the white parts.