I have suffered decades from back problems so severe as to frequently disable me with agonizing pain. Multiple breaks to my metatarsals and several foot surgeries limited my ability to walk any distance. Since beginning to wear the Cloudsurfer last year I walk rapidly for miles now, as much as 6 hours on a day off. No back pain, no knee pain, no hip pain, no foot pain. Unbelievable! They would be the only shoe I ever wore if I could get away with it. It has changed my life! Thank you. I am about to order my third pair, winter edition, since last year was a bit cold on my feet.