Steeple Vultures bat artwork on a new American Apparel t-shirt. Bat by Chris Wright and logo by Steve Oliva/KitchenIslandShowPrint.
Brown, slate, and white shirts are 100% Cotton. The brown shirts appear discolored in their photo but are really plain old brown.
Heather gray shirts are 50% polyester/25% rayon/25% cotton ("The Track Shirt").