24dB Noise Reduction Rating (NRR) with filter caps inserted * Lowers potentially dangerous noise levels above 85dB * Hear safe sound levels (with filter caps out) as if you weren"t wearing ear plugs * Made from hypoallergenic, medical-grade polymer that"s soft, durable, and long-lasting * Ear Lock by SureFire retention ring utilizes seven contact points to lock earpiece in place and fit the same way every time