Check out the Batman Symbol Heather Grey Adjustable Cap which is made from 60% acrylic, 20% wool, 10% cotton, and 10% polyester! Wow, that's a whole bunch of stuff going into this fine hat. I wonder if Wayne Enterprises had anything to do with its construction? The Batman Symbol Heather Grey Adjustable Cap probably acts like a sonar device and will help to track the Joker. Probably. The Batman Symbol Heather Grey Adjustable Cap has a yellow bill, a grey heather body, the heart warming Batman symbol, and an adjustable closure for comfort!