EP7 Sonic Defenders Ultra earplugs protect your hearing against Noise Induced Hearing Loss (NIHL) without interfering with your ability to hear routine sounds or conversations. Their foam-tipped stem design featuring soft memory-foam Comply Canal Tips fits most people and provides a Noise Reduction Rating (NRR) of 28 dB. Sounds at safe levels are allowed to pass through into the ear canal while potentially harmful noises (above 85 dB) are reduced via a proprietary design that incorporates a special noise-reducing filter. EP7s include attached filter caps which can be inserted for additional protection and blocking out lower-level noise in situations where hearing ambient sounds or conversations isn’t critical.