3M™ E-A-R™ Model 4000 Multi-Position Earmuffs 331-4000

Provides outstanding comfort and protection at a budget-conscious price. *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR according to the authority in your juristiction or reduce by 50% for estimating the amount of noise reduction provided. 3M is Leading the Advancement of Hearing Conservation™. Noise Reduction Rating when worn over the head NRR 27 dB/CSA Class A. When worn behind the head or under the chin NRR 26 dB/CSA Class A *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR according to the authority in your juristiction or reduce by 50% for estimating the amount of noise reduction provided. Show Less