In " Batman Begins " , what problem was caused by making the foam for the cape black ?
In the 2005 film " Batman Begins " , the cape was also used as a sort of wingsuit ; when an electric current was applied to the cape , the shape - memory fibers ( much like Shape memory polymer ) aligned into a semi-rigid form resembling a bat 's wings , allowing Batman to glide over the streets and rooftops of Gotham .