About 6 months ago I invested in the premium seats for my P85. As they are much more comfortable, especially on long drive, I love these seats. However, the head rests (which are integrated into the seat and not adjustable), do not provide any support for the neck and head. How Tesla overlooked this for a $3,000 seat is beyond me, but regrettably they did. So I made my own headrests and set them precisely to provide full neck support. I bought a set of aftermarket headrests that strap around the seat but had to dye them to match the tan color of the seats. Then added embroidery of the Tesla logo in red. Cost about $150 total. These make a major difference in comfort, especially on a long drive.