The MicMuff Microphone Cover lets a noise canceling mic do its job above 97dB. Eliminates ambient cockpit noise and noise from radios and intercom. The noisier the cockpit (warbirds, open cockpit, large engine aircraft), the more dramatic the improvement in noise reduction and clarity. MicMuff Microphone Cover must be used on all helmets installed in the communications system. Soft, washable leatherette cover over foam sleeve creates chamber around mic. Cockpit noise has limited access to mic cartridges, but voice enters easily through holes in leatherette cover. Doesn’t blow away.