My wife and I purchased orthotics from the store in Reno while on a ski vacation in Tahoe. I was having a lot of problems with my right knee and my feet were alsways very sore and tired at the end of the day. The orthotics aligned my ankles and the tech at the store showed me how it rotated my knees to a straight position and I stood strighter and taller and I felt the stress relieved in my knee immediately. Been over a year and I couldnt be happier. We return for fressh cushions every year during our ski trip.