Earmuffs feature a stainless steel headband construction that resists bending and warping. Earcup pivot points that tilt for optimum comfort and efficiency. Ultra light. Recommended for TWA noise exposures up to 98 dBA. Noise Reduction Rating (NRR)*:23 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.