I began running in other brands but many years of martial arts has taken its toll on my knees and joints. I almost switched to cycling, giving up my hopes for running, due to knee pain. I initially purchased a set of ON's at my local running store just to wear casually because I liked the styling so well. While the standard Cloud is a neutral shoe and I need a light support shoe, I decided to add an insole for extra support and give them a shot during a workout because they were so comfortable. Instantly, most of my knee pain was gone. I purchased a set of Cloudflyers (ON's light stability model) and I now have zero pain. ZERO. I don't know how it works but I now wear nothing else and I no longer have to give up running. Thank you ON for keeping my feet turning over one stride at a time. You have made a customer for life.