I love these sandals and they are super cute. but since I have thin ankles, I had to take them to my cobbler and have 5/8 inches taken in on both sides of straps where they attach to the back zipper area. This compensates for the fact that the straps that cross the foot are loose across my foot so I slide forward.
My cobbler did a fantastic job and I am now waiting for warmer weather to wear them!