The Kask SC2 ear defender is suitable for environments with a medium to high level of noise. An excellent choice in high frequency noise situations, the ear defenders adhere to smooth telescopic size regulation and are non-conductive. Conforming to: EN352, they clip straight into the Zenith helmets without an adapter. Requiring the KAWAC00003 bayonet adapter for the plasma helmet (sold separately), these SC2 ear defenders have an SNR rating dependant on helmet combination (Plasma, HP, Superplasma - SNR 31, Zenith - SNR 29).