Features Sound Management Technology SMT which improves employee safety by blocking harmful noise while allowing voices and signals to be heard more naturally Features . 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 Specifications . Style Multi position. CSA Class AL. NRR dB 30. Attenuation Level High. Weight 0 88 lbs