Alpine MotoSafe Duo consists of two complete sets of motorcycle earplugs: one set of MotoSafe Tour earplugs and one set of MotoSafe Sport earplugs. MotoSafe Sport: the ideal earplugs for riding on the highway, the racetrack, or while riding with an open-face helmet. MotoSafe Tour: the ideal earplugs for touring rides, holidays, and riding on secondary roads. The MotoSafe earplugs reduce harmful noise without making you feel cut off from your surroundings. Surrounding traffic, the navigation system, the intercom, and the motorcycle itself remain clearly audible thanks to the innovative AlpineAcousticFilters™.