Definitely order at least 1 size up- they run small and seem very narrow. If you have a wide foot, then these probably are not for you. I am a 9 and ordered a 10, but I wish mine were a half size larger. I've only worn them a couple times and they seem comfy enough- I do notice the difference in arch support between these and my cheapo Target flip flops that needed to be retired this year. I would definitely buy these again, but I would order a size 11- a full 2 sizes larger than I normally wear.