The use of several foams in varying densities, and strategically placed, make for a well made seat. The key is that the guy understands the ass ergonomics and does his job well. You can't just slap a fancy seat cover over any crappy foam. I do bags and such, and one day I may venture into the seat re-upholstering business, but it's a full time job. I have a lot of respect for the people like him.