3M E-A-R Caps feature comfortable foam caps on a flexible band block the earcanal opening. Flexible band holds caps in place. Easy to put on and remove.• Soft foam caps block the entrance to the earcanal. Band is worn under the chin • Ideal for intermittent protection needs • Noise Reduction Rating (NRR)* 17 dB. CSA Class BL *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.