SureFire EP4 Sonic Defender Plus Hearing Protection Ear Buds protect against noise-induced hearing loss without compromising your ability to hear regular sounds or conversations. The unique triple-flange stem provides advanced 24dB noise reduction rating (NRR) while allowing safe sounds to pass through. The ear buds include attached filter caps that can be inserted for additional protection, blocking out lower-level noise like those heard on an airplane when hearing ambient sounds isn't important. Each is made from hypoallergenic polymer for all-day comfort and durability. Patented Ear Lock retention ring for secure fit. Protects against loud, sudden noises while allowing regular sounds to pass through 24dB noise reduction rating Proprietary noise-reducing filter reduces potentially harmful sounds above 85dB Attached filter caps can be used to block out all noise Soft, durable, hypoallergenic polymer