For noise levels up to 101 dBA, 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. – Liquid/foam filled earmuff cushions. – Color-coding for compliance sighting. – Noise Reduction Rating (NRR)*: 27dB. 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™.