For noise levels up to 95 dBA. This over-the-head, folding earmuff featurea a stainless steel headband for consistent force and effective hearing protection. • Folding - Cups fold up into the headband for compact storage • 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™.