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Listen to your ears! Your hearing health should always be a priority. The SureFire EP4 Sonic Defender Plus is designed to protect your ears against noise-induced hearing loss (NIHL), while still allowing you to hear routine sounds and conversations in noisy environments. Its triple-flanged-stem provides a Noise Reduction Rating (NRR) of 24 dB. The Sonic Defender Plus has a proprietary noise-reducing filter that allows safe sound levels to pass through into the ear canal, while reducing potentially harmful noises (those above 85 dB). The EP4s also come with filter caps that can be inserted for additional protection, blocking out lower-level noise, such as what you might hear on an airplane, where hearing ambient sounds or conversations isn't critical. These earplugs are made from a soft, durable, hypoallergenic polymer that provides all-day comfort and extends product life (up to 6+ months, depending on usage and care). With patented EarLock retention rings, the Sonic Defender Plus utilizes seven contact points to lock earpieces in place, ensuring a comfortable and secure fit every time. The soft, double-flanged stems provide an even more secure seal, and they can be worn all day without discomfort.