3M Peltor Optime 95 hard hat attached earmuffs feature a universal mounting attachment that fits most hard hats.For moderate noise levels, this hard hat attached earmuffs feature a universal mounting attachment that fits most hard hats. - Universal mounting attachment fits most hard hats - Stainless steel construction resists bending and warping. - Earcup pivot points tilt for optimum comfort and efficiency. - Ultra light with foam filled earmuff cushions. - Color-coding for compliance sighting. - Noise Reduction Rating (NRR)*: 20 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.