Surefire Sonic Defenders are affordable, reusable "full-block" ear protection. Sonic defenders feature 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. Sonic Defenders 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. Their low-profile is design to be worn with a mask, helmet, or supplemental hearing muffs, as well as makes them more comfortable for sleeping. This set of Sonic Defenders are size medium and fit most adults