3M Peltor Optime 101 over-the-head earmuffs feature a stainless steel headband for consistent force and effective hearing protection.For loud environments, these over-the-head earmuffs provide effective hearing protection. - Stainless steel headband distributes weight for low-pressure fit. - Earcup pivot points that tilt for optimum comfort and efficiency. - Foam filled earmuff cushions. - Color-coding for compliance sighting. - Noise Reduction Rating (NRR)*: 25dB. CSA Class A. *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.