I have to give one star because these are supposed to be walking shoes and they really arent.  My knees begin to hurt walking less than half a mile around my neighborhood. This does not happen when wearing my other major athletic brand walking shoes. I don't have knee problems either. There just isn't enough support for the impact of walking. They are super comfortable and light weight. And if I was only using them to walk from my car into a Yoga studio they would be perfect. But they are advertised as walking shoes and they arent. I have the 4 series and I am now reading complaints that they are not as well made as earlier series.