ELVEX HB-640 Elvex flat-liner ear muffs have redesigned these ear muffs to offer a medium level of attenuation and maximum level of comfort. The benefits of these ear muffs include: low headband force, soft, wide ear cushions which distributes force over a larger surface area, and a steel headband that tolerates temperature extremes without losing force. This earmuff has the right attenuation for most noise environments and has 26dB NRR from certified US laboratory to ANSI S3.19-1974 and 32dB SNR to CE EN-352-1. This is a flat-liner muff with maximum comfort 26dB NRR, 32dB SNR. Protection Level 99-109Db.