rokids toddler kids spider-man package root slippers red/blue 13 little kid rokids <p>size suggestions: 1. please measure usually wear <strong>shoes insoles length</strong> and choose size according to followings.</p><b>size detail</b>us 8 little kid - inner length of the shoe: 5.90"/15cm;<br>us 9 little kid - inner length of the shoe: 6.49"/16.5cm;<br>us 10 little kid - inner length of the shoe: 7.08"/18cm;<br>us 11 little kid - inner length of the shoe: 7.87"/20cm;<br>us 13 little kid - inner length of the shoe: 8.46"/21.5cm;<br>us 1 big kid - inner length of the shoe: 8.85"/22.5cm;<br>us 2 big kid - inner length of the shoe: 9.25"/23.5cm;<br><p>please purchase bigger size is better than small size if you are not sure. </p>