3M™ Model 1000 Earmuff

•These lightweight earmuffs may be worn over-the-head, behind-the-head or under-the-chin •Large ear cup openings and soft, foam-filled cushions offer a snug, comfortable fit •Durable, lightweight construction of non-conductive, dielectric plastic •Noise Reduction Rating* NRR 20 dB (CSA class B) when the band is worn over-the-head. NRR 22 dB (CSA Class A) when the band is worn under-the-chin. NRR 22 dB (CSA Class B) when band is worn behind-the-head