A Snoopy cap, or communication cap, is a part of a space suit worn by American astronauts on the head and incorporating an audio headset for communication.[1] The cap is nicknamed after the Peanuts character, whom its black and white paneling resembled.[2] Its NASA designation is Communications Carrier Assembly.[3] The "Snoopy cap" includes two earphones and two microphones, to tolerate failure of a single unit.[4]