For material that is comfortable winter or summer, in dry or humid conditions, IMO you can't beat polyester blends for resistance to fade, napping, staining. Seldom, if ever, does the material thin out. Far easier to care for too, just vacuum every so often and shampoo once every two years or so.
Beats all those fake leathers like Ultraleather (or any of the other fake names for leather) hands down.
Have to say though that the real leather on my chairs is nice and soft, problem is it picks up the black from my jeans or grime from my hands way to fast. Easily cleaned with a rag and plain water with a bit of Dawn, it's just annoying to have to wipe them clean every couple days. So much so, that I don't. Once a month is more like it.
I have seen leather/polyester chairs that had the center panels all leather and the sides and edges poly so they wouldn't get dirty so fast...those seem pretty neat...I don't know how much they'd cost to have made though. But they'd be in the salvage market probably. So would all leather chairs, hard part would be to find 'real' leather instead of one of the fake leathers.