Thnx for the info. And, the airwave system is twice as much as the smooth moves, but if they work better and the end result is a much better ride, It would be worth it for anyone with a bad back. I have had a disk removed from my lower back and two out of my neck. I still have two more to have fixed in my neck. Sooooooooo, anything I can do to make my fishing trips more enjoyable is a plus for me and money well spent! Thnx again!