Runs a little small but MAN these sandals are where its at. Theyre surprisingly flattering on my wider feet and SO lightweight! Just the right amount of arch support. I would say they run a half a size small (I like little to no spare room in these type shoes) I normally wear a 9 and the 8.5 fits perfectly. Excited for these to replace my $100 other brand (with the lizard) heavy shoes - they just don't work with my feet anymore