I'm usually a 9 in women's. I ordered an 8 (child size 6) and after some minor stretching, they fit well. As suggested by many reviewers and the manufacturer, to stretch the sandals I put them on and dunked my feet in a tub of warm water for about 5 minutes. I'd soak them longer and bend your feet, stand up, etc. if the sandals are really tight. The manufacturer also has instructions to stretch the side straps outward with your thumbs (don't worry, there's a picture on the shoe box) and where to bend/squeeze the sole to make the sandal fit more comfortably. I'd maybe try this before soaking them to see if you need to soak them at all. I haven't worn them longer than an hour or so yet so I can't comment on how comfortable they are all day. The only slight complaint I have is the inside of the ankle strap on my right foot rubs a little too much where the two pieces of leather are sewn together. I'm hoping this will soften after more wear (or maybe if I soften it with water or file it down or something). Also, the soles are not as cushy as my Haviannas so that took a little getting used to. All in all, a good purchase.