H540A 3M Ear defenders Peltor Optime IIIA

Headband. Extra wide, soft headband for optimal comfort even during long wearing periods.

Designed for use in extremely noisy environments. Dual cup design minimizes resonances in the system and gives a smoother attenuation over the whole frequency range. The space between the cups is acoustically coupled to the space in the inner cup. This means that the hearing protector performs like a cup with the volume of the outer shell, providing optimal low-frequency attenuation. The cups have different resonances, and are separated by a compressed layer of special foam material which provides a good fit and low pressure.