Affordable, reusable "full-block" EP5 Sonic Defenders Max 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 26dB. EP5s are an excellent choice for industrial, tactical, and general applications where maximum protection against continual noise levels is desired and the ability to hear ambient sounds or conversations is not a priority. EP5s are made from soft but durable, hypoallergenic polymer for all-day comfort and an extended product life (up to 6+ months, depending on usage and care). Their patented EarLock retention rings lock the earplugs in place, while soft, adjustable triple-flanged stems provide secure seals in the ear canals. A low-profile design allows EP5s to be worn with a mask, helmet, or supplemental hearing muffs, as well as makes them more comfortable for sleeping. EP5s come in three sizes,small, medium, and large with mediums fitting most adults.