Acoustically transparent open-cell synthetic foam. Prevents water damage to speakers.Car door speakers are prone to water ingress due to the harsh environment found in there application. A number of problems may occur over a period of time, which will affect the speaker's ability to reproduce music accurately. Speaker terminal corrosion can result in loss of audio signal or worse, electrical shorts causing damage to car radios or amplifiers. Speaker cones and surrounds can absorb excess moisture causing a break down in the speakers mechanical longevity and musical performance.Skinz Moisture guard with its acoustically transparent open cell foam structure forms a moisture proof barrier to prevent water ingress and help extend the mechanical and electrical life of any speaker system.