OK, they aren't fixed. But, when I use this it doesn't hurt as much. My PT suggested using it after I tried it in his office. He was literally busting out of his clothes, like the Hulk. But I digress. He told me to get one, and well, whatever he was selling I would have bought.But it did/does work. Whenever I sit on a chair, and put it in it's proper placementthat reminds me, I have to make an appointment to see my PT.
Rating: [5 of 5 Stars!]