There may be something added to the cowl that alters how people see Batman when looking at him directly. Batman's cowl has sometimes served other purposes. Occasionally, the cowl is depicted as having defense mechanisms such as electric shock or stun gas in order to prevent unauthorized removal (as shown in "The Dark Knight, , Superman/Batman, and Justice League of America #24"). In "Batman Begins", Bruce Wayne mail orders the materials to build the cowl through a maze of untraceable shell companies. To avoid suspicion, Wayne orders very large quantities of 10,000, each part sent to different location, and under different aliases. However, because some superpowered individuals such as metahuman hitman Tommy Monaghan have the power to see through solid objects, Batman also lines the cowl with lead to protect his identity. That property is absent in "The New Batman/Superman Adventures" crossover "World's Finest", where Superman saw through Batman's cowl with ease.