The jolly roger flag was flown by pirate ships to instill fear in their victims to encourage them to surrender without a fight. One can only imagine the fear and madness that would follow when faced with the great Cthulhu! A Jolly Roger version of Cthulhu, that's anything but jolly. Printed in Khaki ink on the back of a high quality 90% cotton, 10% polyester heavyweight hooded sweatshirt, with a smaller version printed on the front left.