I have been running in KSO's for about a month now. These shoes have a terrible design IMO. There is no protection to the right of your big toe on the right shoe and vice-versa on the left. If your big toe does not come down on the "sole" part and slips to the side of the other toes your big toe just constantly grates on the fabric and the surface. There's nothing to ensure it stays within the toe "pocket." A rather terrible design and a regretful purchase. Passable for walking but not for running whatsoever. I will be recommending anyone interested in these shoes to pass on them.