These shoes are very comfortable and stylish!
To the people having trouble with the back strap slipping down (I had this problem too), I found a solution. Take the shoes off and velcro them to the setting you would want them at. Then, pull the back strap up on the velcro side to the height that supports your ankles/feet. Use a few dots of super glue on the outside strap that connects to the string that goes to the middle of the shoe. I used this method a few weeks ago and the strap hasn't budged since. Also, you can't see the superglue, so I am hoping this will be a permanent solution.