Patented Air Flow Control™ technology, delivering optimal attenuation across all frequencies without increasing earcup size or weight. Padded foam headband delivers long-wearing comfort with minimal pressure on the head. Robust steel headband withstands demanding use, especially in tough environments. Snap-in ear cushions make replacement quick and easy. Telescopic height adjustment remains fixed during use. Material(s): ABS Plastic; Noise Reduction Rate (NRR): 27 dB.