One thing I noticed when I was trying to smoke in the car was that I have never ever ever burned a hole (even partially) in jeans, while I have in every other type of material, with a leather jacket (the hard leather kind) I have noticed the same thing. It looks like a leather jacket and jeans are impervious to this as it has never happened (not even discoloration) in a whole year. Has anyone else noticed this or am I just getting lucky?