I drive 4 to 6 hours a day sometimes if not longer was using this primarily in a brand new GMC truck,. It actually created more of an issue because of a hotspot that occurred after using this seat cushion were the edge of the seat meets under your knee.
I have tried a couple others seat cushions and this actually is the worst one I have tried so far.
I will be contacting the manufacturer to have this returned. It is not worth my investment at this time. Just to be clear, I did purchase this based strictly on reviews. I'm not saying that this won't help other people. It just does not help me. And it is quite the investment, considering some of the other options out there for half of the cost.