Not as helpful as I had hoped from the other reviews
I tried this for several days for assistance with tailbone and sciatica from having to sit for long periods of time. I thought it was too stiff and caused more problems than it solved. It's shaped to help keep you in a good postural position and I would probably try using it again on a hard chair. What to do with it in the mean time? You need to be flexible to use it. Not a medical opinion, just mine.
Rating: 3 stars