The 3M PELTOR Optime III Passive Ear Muffs H540A. Headband option.
Developed for use in extremely high noise environments, particularly those dominated by low frequency sounds.
The sealing rings are broad and filled with soft plastic foam for the best fit and low contact pressure. The Optime ear muff stands for effective protection and highest comfort for the wearer. An acoustic connection between the inner volume and the volume between the casings provides maximum low-frequency attenuation.
Recommended uses: in airports, mining, power plants, in naval and construction industries.