SO COMFY! In this brand I would have loved to have a 8.5 but the 9 is fine. Just a little too large for my liking. I would say if you are a half size, round down. I bought these shoes because I do not like to wear flip flops and these are a lot more secure than a flip flop. Be aware that they do make the flip flop noise! Have worn them for 4 days and the fabric has been stretched out, allowing for the flip flop noise. Good everywhere shoes in the summer.