I wish I had not listened to the reviews that said to size up. I'm a size 8, sometimes 8.5. I went with the 8.5 in this shoe and it is too large. There is extra room both in the length of the toe bed and in the heel, so my foot keeps slipping out. If I keep them, I'll only be able to wear them with tights or socks. They are cute, but frankly not very well constructed. And there is no arch support whatsoever. I got these for a good deal, so I'm not complaining, but I would have been seriously disappointed if I'd paid full price.