E-A-R™ 8052930013 Lightweight Earmuff, 21 dB Noise Reduction, Black/Maroon

3M™ earmuffs feature durable, lightweight construction of non-conductive, dielectric plastic that mounts to most hard hats without an adaptor and easily swing out of the way when not in use. Mounts to most hard hats without an adaptor and easily swing out of the way when not in use. Lightweight, durable plastic construction is non-conductive and dielectric for tough environments. An "at-rest" position eliminates contact with other gear to reduce contamination and distortion. Works with most slotted hardhats - noise reduction rating NRR 21 dB CSA class B . 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™.