3M™ Peltor™ Optime™ 98 cap-mount earmuffs feature a universal mounting attachment that fits most hard hats. Benefits •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. •Noise Reduction Rating (NRR)*: 23 dB. CSA Class A.