I bought these as a gift for my husband who is apparently really hard to fit. I still haven't figured out why, because he's a normal 9 typically, but even if I bring him along to try shoes on, we usually leave empty handed after trying many pairs of shoes. I just ordered these based on what I read on the Mizuno site and used the fit tool based on a pair of old shoes, and they are PERFECT. He loves the feel and the look of them. He doesn't run much more than a rare jog these days (mostly due to time constraints) although has run a marathon in the past.