These over-the-head earmuffs offer high noise attenuation with a Noise Reduction Rating (NRR) of 31 decibels to help protect hearing in very high-noise exposure environments. The pacer improves attenuation without excess bulk or excess weight. When correctly selected and worn, this lightweight hearing protection helps reduce exposure to hazardous levels of noise and loud sounds. Wire headband offers consistent pressure. Earcup pivot points tilt for optimum comfort. Design of the Peltor X-Series Over-The-Head X5 Earmuffs ear muff also features replaceable ear cushions and foam liners.