The X-Series earmuffs are 3M"s latest advancement in hearing conservation. New technologies in comfort, design and protection all come together in this groundbreaking earmuff line. The X4P3E utilizes a newly designed spacer, specially formulated foam liners and innovative ear cushions to help improve attenuation. This lightweight, lower-profile earmuff helps with compatibility with other personal protective equipment and is designed for protection against moderate-to-high level industrial noise and other loud sounds. Noise Reduction Rating (NRR)a 25 dB. CSA Class A. The NRR may overestimate the hearing protection provided during typical use. Hearing protection solutions made innovatively easy. The 3M Peltor X series earmuffs are ideal for protection against noise arising from a wide range of applications in the workplace and leisure activity. Examples of typical applications include: metal processing, automotive, airports, construction, textile manufacturing, chemical and pharmaceutical, manufacturing, cement manufacturing, printing, woodworking, heavy engineering, foundry, steelworks, mining and quarrying. Headband and headband cover/sleeve: stainless steel wire, TPE, polyester, polypropylene, acetal. Hard hat attachment arm: stainless steel wire, acetal, polyamide. Earcups: ABS/TPU. Earcup inserts: PU foam. Earcup cushions and cushion covers: PU foam and PVC. Black/chartreuse color. Hearing protection style: hard hat attached. Noise reduction rating: 25 decibel. Product type: earmuffs. Size: one size fits most.