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. Benefits •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.