SureFire EarPro EP4-Sonic Defenders Plusoffer excellent ear protection while allowing you to hear routine sounds or conversations. The triple-flanged stem allows for use with larger ear canals as well. The noise reduction rating of 24dB. Sounds that are usual can seamlessly pass through, while harmful ones are block. There are additional filter caps that can be inserted for additional protection and for blocking out lower level noise. The SureFire patented Earlock retention ring locks the earplugs in place. This earplug can be worn while wearing a mask or head gear.