I have another pair similar but cheaper than these from Teva that needed repairing because the strap pulled out on one side. This design has the strap both entering the top and bottom of the soles...two soles. Looks like a promising design and will update...These fit me like a glove and are very comfortable yet very supporting and stress bearing. I found the arch support was in the perfect location (straps allow you to move your foot to locate properly on arch) but others I tried at a shoe store never felt like they aligned with my foot.