3M™ Peltor™ Hi-Viz, cap-mount earmuffs features bright orange colored earcups for added visibility. Universal mounting attachment fits most hard hats. Earcup pivot points tilt for optimum comfort and efficiency. Ultra light with liquid/foam filled earmuff cushions. Noise Reduction Rating (NRR)*: 23 dB. 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.