Please be sure that you have no knee problems before purchasing these shoes. I never even knew I had a knee problem aside from some occasional soreness of the left knee. These shoes were professionally fitted at a store catering to medical professionals and athletes. They were very comfortable at first but soon I developed knee pain in the left knee which progressed in severity until I was unable to walk with out severe knee pain and my wife and others could hear my knee grind even outside when I walked. When it finally dawned that it could be the shoes I had worn them for 6 months. I switched to a Rockport Prowalker and cushioned running shoes and the majority of the pain resolved over 6-8 weeks. About a year after I first started wearing these shoes the pain is about to baseline with increase in pain if I am on my feet for long periods of time. I am a doctor and purchased the shoes to help in this regard since I work 14 hours on my feet on hard floors.
I would never recommend this type of shoe to anyone but especially to anyone with any knee problem, no matter how minor.