I have to agree with all of the other reviews for these running shoes. They do run small, so ordering a half size up worked out just fine for me.  I have never purchased a pair of Mizuno shoes & am quite happy with them thus far.  I'm half way through my training for my first half marathon & have found these shoes to offer great support for my feet.  I love that they hug my ankle to prevent rubbing, especially on my long weekend runs!