3M PELTOR X4 Earmuffs offer a slim lightweight option with a Noise Reduction Rating (NRR) between 25–27 dB, depending on attachment type. This low-profile earmuff is ideal for protection against mid- to high-level industrial noise and other loud sounds.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.