Howard Leight by Honeywell Leightning L3 Noise-Blocking Earmuffs, 30NRR, Black/GrayExcellent noise-blocking performance and superior comfort-wear features keep the Leightning hearing protection line a leader in maximum protection and contemporary design. Patented Air Flow Control technology ensures optimal attenuation across all frequencies. Robust steel construction withstands demanding use, while telescopic height adjustment ensures solid fit. Telescopic height adjustment remains fixed during use. Super-soft, snap-in ear cushions deliver superb comfort with minimal pressure on the head; and make replacement quick and easy. Material(s): Steel/Foam/ABS Plastic/PVC; Ear Cushion Material: Foam; Noise Reduction Rate (NRR): 30 dB; Style: Headband.