Skullerz 8881 Non-Conductive Hard Hat Mounted Earmuffs are designed for comfort and noise reduction both on and off the job site. These noise-reducing earmuffs seamlessly integrate onto Skullerz Hard Hat and Safety Helmet's dedicated side accessory mounting slots for a secure fit. The padded and foam-filled earcups are adjustable and can be tilted up, down or stored onto the side of the hard hat or safety helmet for customized wear. The low-profile and lightweight design allows for smooth movement in tight workspaces and reduces snag hazards on busy job sites. The earmuff features a durable ABS outer construction for long-lasting protection in tough environments, while non-conductive arms with no metal parts provide 1,000 V electrical protection. Built to accommodate Skullerz hard hats and safety helmets, the non-conductive arms feature a one-size-fits-all design that lets you easily adjust their orientation to match different brim styles and helmet shapes. These earmuffs include two plastic adapters that must be attached to the side accessory slots when installing directly to Skullerz Hard Hats or Safety Helmets. Because the earmuff and face shield adapters are identical and interchangeable, the earmuffs attach directly to the adapters even when a face shield is installed, providing a fully compatible, all-in-one head-protection solution. These mounted earmuffs are tested to ANSI/ISEA S3.19-1974. Noise Reduction Rating (NRR) varies by head protection type. Ear Muff Style: Cap Mounted; Attenuation Rating: Type 1 Full Brim Hard Hats: 25 dB; Type 1 or Type 2 Cap-Style Hard Hats: 25 dB; Type 1 or Type 2 Safety Helmets: 27 dB; Type 2 Full Brim Hard Hats: 27 dB; Dielectric: Yes; Folding: Yes.