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These 3M low-profile and lightweight earmuffs may be worn over the head, behind the head, or under the chin. Provides a protective seal without excess pressure while the pivoting earcup connections maintain the seal and proper alignment. Large earcup openings and soft, foam-filled cushions offer a snug, comfortable fit. Constructed of non-conductive, dielectric plastic. NRR 20 db when the band is worn over the head, NRR 22 db when the band is worn under the chin, and NRR 22 db when the band is worn behind the head.