The one size fits most Joker Hair Beanie should do a great job of keeping both your head and your crazy warm. Oh, you didn't realize that your crazy needed to be warm? That's probably why you keep hearing voices in your head...or at least that's the excuse I always go with. Made with a faux hair, the Joker Hair Beanie is a great way to emulate the Clown Prince of Crime without having to suffer a nasty spill into a vat of chemicals.