Back strap should have a buckle or elastic.  Wish I had listened to other reviewers who said back strap was too short,  because it is.  Have blisters on big toe on one foot because strap pushes foot too far into shoe.  Don't know what to do with these--definately can't continue to wear them the way they are.  Are these "seconds"?  It's hard for me to believe Clarks would allow a product like this!  Not happy with my purchase, but can't return because I have worn them.  Don't recommend purchase.