Sound management earmuffs feature a uniform attenuation to let you hear co-workers, instructions and other important sounds more naturally while blocking out harmful noise. The dielectric construction is suitable for all workplaces. Comfortable design creates a uniform headband pressure for all head sizes to provide a relaxed fit during extended wear. Inner-ventilated headband minimizes pressure on your head and breathes easier in warm or humid climates. Nondeforming outer headband withstands rough treatment in tough environments. Quick-Click height adjustment remains fixed during wear. Snap-in ear cushions make replacement quick and easy. Earmuffs are designed with a Noise Reduction Rating (NRR) of 20.