Note: Size "MEDIUM" Fits (90%) Most People. Proper size is based on the dimensions of your ear's concha bowl. EP4 Sonic Defenders Plus SureFire EP4 Sonic Defender Plus will protect your hearing against Noise-Induced Hearing Loss (NIHL) without compromising your ability to hear routine sounds or conversations in noisy environments. Their triple-flanged-stem provides a Noise Reduction Rating (NRR) of 24 dB. Safe sound levels are allowed to pass through into the ear canal, while potentially harmful noises (above 85 dB) are reduced via our proprietary noise-reducing filter. EP4s include attached filter caps that can be inserted for additional protection, blocking out lower-level noise, like that heard on an airplane, where hearing ambient sounds or conversations isn't critical. Sonic Defenders 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). Patented triple-flanged stem earplugs that deliver superior hearing protection Provide a 24-dB Noise Reduction Rating (NRR) Soft, durable, hypoallergenic polymer provides all-day comfort Features EP4 Sonic Defenders Plus: Provides a 24-dB Noise Reduction Rating (NRR) with filter caps inserted Lowers potentially dangerous noise levels above 85 dB Patented EarLockA(R) retention rings utilize seven contact points to lock earpieces in place and fit the same way every time; soft, double-flanged stems provide secure seals and all-day comfort Made from hypoallergenic, medical-grade polymer that's soft, durable, and long-lasting Low-profile design for superior comfort when worn with a mask, helmet or hat, or while using a phone, headphones or supplemental hearing muffs Serve as earpieces for compatible radio communication systems* Each set is packaged in a convenient carry case and includes a polymer lanyard Note: EP4 earpiece will not provide hearing protection if the noise-reducing filter is removed Radio Comm System Compatibility EP5 Sonic Defenders MAX Block The dB. Hearing protection isn't a game. It's crucial to the prevention of Noise Induced Hearing Loss (NIHL). Affordable, reusable, full-block EP5 Sonic DefendersA(R) Max earplugs utilize a soft, adjustable, triple-flanged stem to seal the ear canal and block out potentially harmful sounds, providing an impressive Noise Reduction Rating (NRR) of 26 dB. They are an excellent choice for industrial, tactical, and general applications where maximum protection against continuous noise is a priority over hearing ambient sounds or conversations.* EP5s are made from a soft, durable, hypoallergenic polymer for all-day comfort and extended life (up to 6+ months, depending on usage and care). A low-profile design allows them to be worn with a mask, helmet, or supplemental hearing muffs. You work in an industrial space. Give your ears industrial-strength protection. Patented full-block earplugs that deliver superior hearing protection Provides a 26-dB Noise Reduction Rating (NRR) to minimize potentially harmful sounds Low-profile design is ideal for use with masks, helmets and other safety equipment Features EP5 Sonic Defenders MAX: "Full-block" design provides 26-dB Noise Reduction Rating (NRR) to protect against potentially harmful noise Lowers potentially dangerous noise levels above 85 dB Soft, adjustable, triple-flanged stems provide secure seals in ear canals and all-day comfort Made from hypoallergenic medical-grade polymer that's soft, comfortable, and durable Patented EarLockA(R) retention rings utilize seven contact points to lock earpieces in place and fit the same way every time Low-profile design for superior comfort when worn with a mask, helmet or hat, or while using a phone, headphones or supplemental hearing muffs 26-inch polymer lanyard included Each set is packaged in a convenient carry case and includes a polymer lanyard