I had read about fitflops and wanted to try them because I have knee and back pain but was hesitant because I have a very high instep.  Reading that these were adjustable, I decided to give them a try and am glad I did.  The soles are nice and springy, not too high, and my foot fits nicely even though I'm a size 11 and based on the other feedback, ordered a size 10.  The strap was snug the first day but has since loosened up and now I wish I could wear them everywhere because they're so comfortable.  After a full day of shopping my feet and legs were tired, but there was NO PAIN.  And usually after a day like that I can barely go from the couch to the door.  What a difference!