I ordered an 8 first because that's a half size bigger than normal for me. The shoes were a bit too small. So I got the 8.5. They fit great and I wore them around town for a while and worked out in them. So two days ago, I decided to take the shoes on their inaugral jog. Well, by the time I was done (30 minutes) I could barely walk. There is a seam on the bed of the shoes where the padding ends and I guess where the manufacturer sews the shoe together. That caused severe blistering on the bottom of my big toes and two little toes on the outside of my foot. Also, my heels were rubbed raw in the back. I'm not sure if these shoes require socks (I assumed not but perhaps so?), but as it is, I will not be wearing them for jogging again.