Definitely improved posture in my car; noticeably, I had to adjust my rear view mirror because I was sitting up taller. Since I have on-again, orf-again lower back pain, I expect this will help. It works less well with my office chair, probably because of the contour of the chair- thus, the 4 stars. But I suspect it will work fine with other chairs. A small plus is that is so light weight, so carrying it around is easy.
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