I planned to send these back for being too large, but had second thoughts.  I am a size 5 in keen but 5.5-6 in other shoes and these were pretty loose.  I was concerned because they only have the back strap to hold them on. I have a requirement of being able to run in a pair of shoes and was worried these would fall off my feet.  Turns out the back strap always catches my heel.  These shoes turned out to be incredibly comfortable.  They ALWAYS stay on my feet.  It doesn't feel like they will, but they do! This isn't a hiking shoe, but you can do a decent amount of urban walking in them without issue.