I purchased these from Orthofeet because I had a discount coupon. I read that they were supposed to help with knee pain. Both of my knees are very bad, osteoarthritis. I wore them to break them in. The next day I wore them most of the day. My knees and back were SCREAMING in pain. I really wanted to like them, but I'm sending them back. As far as sizing, I read that you should go Up a half size. Definitely true.