Don't quote me on this, but my friend is a dealer (car, not drugs), and he says the leather on the GTS is synthetic. I wouldn't personally bother if its fake, I'd do cloth, but hey, its your life.
Heh, no way. The leather in the celicas is genuine, no doubt about it (My driver's seat even has a "Scar" that belonged to the cow originally, no joke)
Seriously, the leather isn't bad, it does get hot in the summer, doesn't squeak all that much, and will wear much slower than cloth. Perforated leather is an available option, and would not only keep the seats cool, but would lighten them up a bit as well over the solid leather seating Like my perticular car has. If the leather were synthetic, they would need to say so by law; synthetic leather is called nagahyde BTW, and actually it will last longer than natural leather.On my seats,almost the entire seat face leather, as are the bolsters, the seatback appears as if it may be nagahyde.