TravelLite™ Seat Cushion by Lifeform®
Product Review (submitted on October 24, 2011):
I use this cushion, along with the Travel-Lite lumbar support, on my computer chair and can surf the Web for hours without feeling any sciantica pain. I have degenerative spinal disease and I have never been able to find a proper support until I purchase both cushions. I don't have an expensive computer chair so this idea was a tremendous relief for me.