Developed for the ultimate protection in the most demanding noise environments. The 3M OPTIME 105 ear muff features added mass and volume, plus a unique “double-shell” earcup design (two cups connected via a foam inner layer to reduce structural resonances) to provide the maximum in noise reduction throughout the full range of low and high frequencies. Up t 105 dBA. Noise Reduction Rating (NRR): 27 dB. CSA Class AL
The 3M Optime 105 Earmuffs will fit KASK helmets when used with the brackets that come in the box with the helmet. Also fits Petzl and 3M helmets.