Communication, like most skills, deserves to have a couple back up plans. Nato phonetic code words, Morse code, sign language and semaphore are all represented on this bandana. Also, instructions on using a signal mirror. Printed with soft water based inks that will hold their color under the roughest treatment. These American made, 100% bandanas are made to be used, and offer you another layer of information that a standard bandana won't.