The light beige H6 Omni Protective Cap from Countryman is used to keep the H6 headset mic element (sold separately) free from moisture, as well as alter the high frequency response of the microphone. The cap slides on an off the microphone element and has a +4 dB high-frequency response characteristic that controls the amount of crispness or sibilance at 15 kHz. Countryman recommends a protective cap be used underneath a windscreen.