For noise levels up to 95 dBA, the lightweight and comfortable behind the head earmuffs feature low profile earcups that fit well with most helmets, eyewear, and other safety equipment. Multi position designs, available in headband, neckband, helmet attachable and folding models. Stainless steel construction resists bending and warping. 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)*: 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™.