Dielectric helmet earmuff. Robust plastic and non-deforming helmet attachment arm. Adjusts to fit a range of head sizes and hard hat styles. Honeywell’s Air Flow Control Technology (AFC) delivers optimal attenuation across all frequencies without compromising comfort. Unique soft moulded ear cushions reduce pressure and enhance comfort. Three kinds of adapters included to fit a variety of hard hats (3713VS1, 3714VS1 and 3718VS1). NRR 26dB SNR 20dB. Tested according to AS/NZS 1270.2002.