3M™ Peltor™ Optime™ 98 cap-mount earmuffs feature a universal mounting attachment that fits most hard hats. A versatile, cap-mount earmuff. For noise levels up to 98 dBA.• Universal mounting attachment fits most hard hats • Earcup pivot points tilt for optimum comfort and efficiency. • Ultra light with liquid/foam filled earmuff cushions. • Color-coding for compliance sighting. • 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. 3M is Leading the Advancement of Hearing Conservation™.