Howard Leight Leightning L1N Light Gray Behind Neck Metal NeckBand Noise Blocking Earmuffs with 25 dB NRR feature patented airflow Control? technology to provide enhanced attenuation across all frequencies. Steel wire earmuffs offer superior performance and durability with added lasting comfort for daily use. Padded foam, tough steel headBand and softer snap-in ear cushions remove squeezing pressure on the head by offering consistent overall attenuation for all industrial noise environments virtually. The patented base plate chamber and high-tech non-woven layer of earmuffs manage flow of air to control the sound that reaches ear. HeadBand comes with telescopic height adjustment feature that allows remaining intact during usage.