SureFire EP4 Sonic Defenders Plus Filtered Earplugs, Triple Flanged Design, Reusable 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 Soft, adjustable, triple-flanged stems provide secure seals in ear canals and all-day comfort Low-profile design allows you to keep them in place while wearing a mask, helmet, hat, or while using supplemental hearing muffs Patented EarLock retention rings utilize seven contact points to lock earpieces in place and fit the same way every time Made in USA from hypoallergenic, medical-grade polymer that's soft, durable, and long-lasting