24dB Noise Reduction Rating (NRR) with filter caps inserted Hear safe sound levels (with filter caps out) as if you weren't wearing ear plugs</br>Soft adjustable triple-flanged stems provide secure seals in ear canals and all-day comfort</br>Low-profile design allows you to keep them in place while wearing a mask helmet hat or while using supplemental hearing muffs</br>Patented EarLock retention rings utilize seven contact points to lock earpieces in place and fit the same way every time</br>Made in USA from hypoallergenic medical-grade polymer that's soft durable and long-lasting</br></br>Product Description</br></br>EP4 Sonic Defenders Plus protect your hearing without interfering with your ability to hear routine sounds or conversations. Their triple-flanged stem design fits larger ear canals 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 a special noise-reducing filter. EP4s include attached filter caps?? which can be inserted for additional protection and blocking out lo