Every 'Tee of Knowledge' t shirt comes with a pocket size field guide to help grow young minds. It's full of interesting chunks of information and a few jokes to make them chuckle along the way, perfect for learning a little bit more about their chosen passion. So not only can your kids wear their T shirt, they can also tell you all about it. 100% organic and printed with Eco-friendly inks. Hand printed in my studio in Sussex.