I read a story that once the US air force tried designing a pilot seat based on the average of the measurements of all their pilots and ended with something that was uncomfortable to all of them.
Do you have a link? Regular pillows are too thick for my head when lying on my back and it hurts my neck. I instead use a folded blanket so I can customize the thickness.
I got the 40x80cm "nature" version which is merino wool, but they also got fiber and down versions with the same concept.
Im sure there are other companies with similar products.