VeriShield 100 Series Passive Earmuffs. Comfortably fits a wide range of head sizes. Wide cup opening is ideal for workers with large ears or who wear hearing aids. Lightweight cushioned headband. Memory foam ear cushions. Oil-resistant cup surface withstands oily, heavy-work environments and frequent cleaning. Features Sound. Management Technology (SMT) which improves employee safety by blocking harmful noise while allowing voices and signals to be heard more naturally. Designed for use with other PPE. NRR 30.