Patented, foam-tipped earplugs that deliver superior hearing protection; Provide a 30-dB Noise Reduction Rating (NRR) to protect against potentially harmful noise; Ideal for industrial, tactical and recreational applications; Full-block design and expandable memory-foam tips provide 30-dB Noise Reduction Rating (NRR) to protect against potentially harmful noise - the highest of any Sonic Defenders earplug; Soft memory-foam Comply Canal Tips provide secure seals in ear canals for near-custom fit and all-day comfort; Patented EarLock retention rings utilize seven contact points to lock earpieces in place and fit the same way every time