What's up with Bruce Wayne's hair?

It just occured to me as I was walking to my car today that we never see Bruce Wayne with any but nice hair. But come on, he wears a cowl like all the time. He should have cowl hair. My guess is that he has some sort of insta-perm device in the batcave. It's kind of funny to think about though. I mean, a simple light hat will completely wilt hair, and he has this large and heavy cowl that covers his entire head. That can't be good for his hair breathing. A few more years, and he'll probably be bald. That, or he already is, and just wears a wig...