We bought these a little on the big side, but as another reviewer mentioned, this was not an issue with the gathered elastic in the back. We love these shoes for our toddler and now that the winter is coming, the shoes are acting as a wonderful pair of slippers for him inside the house and on the porch. I am looking into getting a new pair of Robeez he can wear outside for the winter.  I did not mention how CUTE they are, and how much our little guy loves them, so I am doing that now!