I'm pretty much always a 4.5-5 in things, but a 5 was comically small on me. There's no measurements listed on the size chart, but on the Nisolo website's listing for this shoe I now see they do say these run small, and suggest going up a half size (although that still might not have been enough--these were TINY). I'd say go up a full size. It's a shame, because they are otherwise really cute and seem like good quality. I might reorder in a 6 or 6.5.Fashionable women’s slide that is well made. The insole and outer are leather. I’m typically a 9/9.5 and the 10 fit great. Size up on these. I’m very happy with these sandals and will likely purchase another pair in a different color.