3M Banded Hearing Protector 1310 features foam ear pads attached to a lightweight band. The unique flexible band maintains low pressure over a wide range of head sizes. Convenient for people who take hearing protectors off and on many times each day. Noise Reduction Rating (NRR)* 21 dB (band worn behind head) and 20 dB (band worn under chin).**The NRR may overestimate the protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided.