Patented Twin-Cup design has soft, foam-filled earmuff cushions. Behind the head design allows for easy use with hard hats. Color-coding for compliance sighting. Noise Reduction Rating (NRR)*: 29 dB. CSA Class AL 3M Peltor Optime 105 behind-the-head earmuffs features low-profile earcups that fit well with most helmets, Feature double-shell technology for effective hearing protection. For noise levels up to 105 dBA, these behind-the-head earmuffs feature double-shell technology to provide effective hearing protection €¢ Patented Twin-Cup design has soft, foam-filled earmuff cushions €¢ Behind the head design allows for easy use with hard hats €¢ Liquid/foam filled earmuff cushions €¢ Color-coding for compliance sighting €¢ Noise Reduction Rating (NRR)*: 29 dB. CSA Class AL *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. 3M is Leading the Advancement of Hearing Conservation.
