This model is presented as an "all terrrain" shoe. It does not do well on hard surfaces due to poor adhesion of sole compounds.  The problem is that the sole consists of two types of rubber that don't adhered well to one another. On the soles of my Grey MT 610s there is an alternating soft yellow (this is the sole base)compound with a  harder back rubber compound adhered to the yellow in segments. The hard back rubber segments began to detach from the yellow after the first run on pavement(4mi). Off road this continued after running through some rocky patches. This would probably not be a problem on soft surfaces. Disapointing nonetheless. I had high hopes for these shoes. NB rarely fails to put out a less than quality product. I hope they get this fixed.