I am 50 y/O and wear a size 9...the European size 40 fit nicely.  I have a narrower heel but with the velcro straps and sizing--slipping was not a issue.  I brought these shoes to Disney World and was able to walk all day in them.  They are stylish and comfortable. They are a more "meatier" sandal design wise...not trim and sleek...not as flattering with a sundress. I liked that the top of the sandal extended down over past the base of my toes...personal preference.  I was hoping that the foot-bed would be more like the Kayla (which I love) but it was just somewhat more padded---still comfortable but not as much support as I was looking for.  Overall I like the sandals and anticipate getting a lot of wear out of them!  :)