3M Peltor Optime 95 behind-the-head earmuffs feature low-profile earcups that fit well with most helmets, eyewear and other safety equipment. Provides effective hearing protection against high-frequency noise.For moderate noise levels, the lightweight and comfortable behind-the-head earmuffs feature low-profile earcups that fit well with most helmets, eyewear, and other safety equipment. - 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)*: 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.