3M PELTOR X5 Earmuffs are a high performance hearing protector designed for very high noise environments; they offer a Noise Reduction Rating (NRR) of 31 dB for headband, hard hat-attached, and behind-the-head models. The high attenuation provided by these earmuffs is a result of a combination of specially-formulated foam in the earcups and cushions with an innovative spacer and cup design.3M PELTOR X-Series Earmuffs deliver comfort, design, and protection in one groundbreaking earmuff line. Additionally, these earmuffs have earcup pivot points that tilt for optimum comfort and efficiency, as well as replaceable ear cushions and foam liners to help ensure acceptable noise reduction, hygiene, and comfort.