http://blueyetipopfilter.com/go Microphone pop filters, also called as pop shields reduce the sibilance that are generated when speaking or singing words that have the B and P sounds. Plosives is the term given to the blasts and pops that are bothersome particularly when heard over the mic . A pop filter functions by placing an obstruction in the middle of the mouth and the mic to eliminate plosives. It also aids in protecting a mic from corrosion by absorbing moisture coming from a person's mouth.