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The Surefire EP3 Sonic Defenders protect your hearing without interfering with your ability to hear routine sounds or conversations. The double-flange-stem design fits most people and provides a Noise Reduction Rating (NRR) of 24dB. Sounds, at safe levels, are allowed to pass through into the ear canal, while potentially harmful noises (above 85dB) are reduced via a proprietary design that incorporates the patented Hocks Noise Braker® filter. EP3s include attached stopper plugs, which can be inserted for further protection and blocking out lower-level noise, like that heard on a plane, where hearing ambient sounds or conversations isn't critical. The right/left color-coded Sonic Defenders are made from a soft but durable, hypoallergenic polymer and are ergonomically shaped, with an adjustable-stem design, providing a secure fit with all-day comfort. And their low-profile design means they can be worn while wearing a helmet or mask, or while using a phone or headset. There's no reason to be saying "eh?" for years to come when you've got the Surefire EP3 deployed.