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When I moved across the country (7 days straight of 6-8 hours in a car), I got this thing from Amazon called the Back Joy for myself and my mom, who was sharing the driving with me (she doesn't have fibro, but osteoarthritis and some fused cervical vertebrae). We both really liked it, it helped so much with back pain and fatigue. I think it helps more on harder chairs, because it does not seem to help me at all when I sit on the couch (but in reading the Amazon reviews just now it looks like there are a few different models and some are better for cushioned chairs).