Whoever invented this is a genius, I'm 6ft 9in, 300lbs and have always had problems with car seats. I have spent an unknown amount of money to have the seats fitted to my back in all the cars I own, foam cushions etc. At first glance after opening the packaging of this airbag I had serious doubts as to how it would work , until I didn't install it in my 2020 GMC Sierra and sat down, WOW what a difference! There isn't much air in the airbag, but it moved into the gap in my back between it and the seat and provided support exactly where it was needed. I also like that the airbag stays in place and doesn't have to be constantly repositioned like other products I've used over the years. I will be buying a few more to keep for future use in case they become unavailable in the future.