3M E-A-Rflex 28 banded hearing protector features soft, E-A-Rform foam tips that reacts to body temperature for enhanced comfort and fit.3M E-A-Rflex 28 features soft, E-A-Rform 28 foam tips that reacts to body temperature for enhanced comfort and fit. • Pivoting tips for proper, comfortable fit that moves with the wearer for more consistent protection • Replaceable foam tips: product number 320-1001 • Noise Reduction Rating (NRR)* 28 dB. CSA Class AL *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.