Addressing the issue of “overprotection,” Elvex’s Flat-Liner earmuff provides flat attenuation – most frequencies from 500 Hz and above are attenuated at a similar degree, in the low- to mid-30 dB range. This allows user to hear voice communications in noisy environments without distortion. Soft ear and head cushions give a high level of comfort.Elvex Corp., Bethel, CT.