I haven't tried it in the car yet, but it works very well on my couch, better than the pillow I'd been using. I'm short so most seats are too deep to sit without back support. Taking long car trip next week so will know how well it works.

If you have to work in an office, chances are your assigned chair will suck. In the past, your options might have been limited: swapping with a co-worker or buying your own chair. With this pillow, you just snap it around the chair you've been given, and suddenly your lumbar area is supported by a very comfortable pad that is fully adjustable up and down the height of the chair. This ingenious device makes any chair comfy. I might even use it on my dining chair instead of an ordinary pillow that doesn't support half as well

I purchased this for use in my car. I would prefer it to be thinner, as it does cause me to sit closer to the edge of the seat than I would like, but not so much so that my back isn’t supported. The only downside is the straps aren’t the best in keeping it at the same height adjustment you set.