3M™ Peltor™ Optime™ 105 cap attached earmuffs feature double-shell technology to provide effective hearing protection. For noise levels up to 105 dBA, these cap attached with double-shell technology to provide effective hearing protection- Proprietary Twin-Cup™ design has soft, foam-filled earmuffs.- Easy cap-mount design- Earcup pivot points that tilt for optimum comfort and efficiency.- Liquid/foam filled earmuff cushions.- Color-coding to help match attenuation needs.- Noise Reduction Rating (NRR)*: 27 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™.