Swivel Car Seat Cushion
You don't need to do the twist every time you get in and out of your car. This ingenious seat cushion works almost like a turntable; it actually swivels so that you move with a gentle slide instead of a harsh twist. (But unlike mechanical turntable-type seats with ball bearings, the Comfort House swivel seat cushion has a soft and comfortable sitting surface.)
The swivel motion is accomplished with a two part 14"-square cushion sandwich. The slippery sateen fabric that covers the inner side of each cushion does the turning for you. For use on any type of car seat and easily moved between vehicles.
More information: http://www.comforthouse.com/swivseatcus.html