3M Peltor Optime III H540P3E ear muff with helmet attachment - Ear muff with helmet attachment - Ear muffs are suitable for use in very noisy environments, especially low frequencies - The ear muff is based on a double hood technology for minimal resonance. This means that high frequencies are very well damped - In addition, the specially designed spacer ring and cap provide excellent protection against low frequencies - The wide sealing rings are filled with soft polyurethane foam, fit perfectly and provide little contact pressure - Effective protection and the most comfortable fit - Average damping value SNR 34 dB(A)