TravelLite™ Seat Cushion by Lifeform®
Product Review (submitted on January 19, 2012):
This seat cushion saved my life when it comes to traveling for long periods of time in the car! I LOVE it! It's very roomy, so one size would fit all! I have had NO problem with the zipper protruding at all. It's a wonderful tool, if you have back issues of any kind. I highly recommend. I will never be without one of these in my vehicle!!!