The Skullerz 8880 Hard Hat Mounted Earmuffs for cap-style hats are designed for comfort and noise reduction both on and off the jobsite. Noise-canceling earmuffs seamlessly integrate into Skullerz Hard Hat and Safety Helmet dedicated side accessory mounting slots for a secure fit. Earcups are designed for all-day, comfortable wear and are also adjustable and can be tilted up, down or stored onto the side of the hard hat or safety helmet to create a customized fit. Earmuff's ABS outer construction is durable for long-lasting protection in tough environments. Polished, stainless steel wire arms offer smooth adjustment and increase longevity of the earmuffs. These mounted earmuffs are tested to ANSI/ISEA S3.19-1974: Method for the Measurement of Real-Ear Protection of Hearing Protectors and Physical Attenuation of Earmuffs. They are tested and certified when attached to Skullerz Hard Hats and Safety Helmets to a Noise Reduction Rating (NRR) of 26dB to reduce noise levels.