I typically wear 9.5 shoes but knew these ran a little small. I ordered both a 10.5 and an 11.5 and only the latter ended up fitting lengthwise. However, they were so narrow that it was impossible to walk for more than a few blocks without feeling pain. Although I was extremely hesitant to get Nike shoes, I ordered the Nike Free Run V2s in a size 11.5 and they fit perfectly. Unless your feet are two inches wide, stay away from these ASICS. To be fair, other styles of the ASICS did fit "better" as far as width goes but they were aesthetically unpleasant.