Honeywell International, Inc 1010924 Howard Leight by Honeywell Leightning L3 Noise-Blocking Earmuffs, 30NRR, Black/Gray by Sperian

Comfortably designed earmuffs feature a padded foam headband and super-soft ear cushions to eliminate pressure on the head. Steel-wire construction offers high performance and robust durability. Air Flow Control technology delivers optimal attenuation across all frequencies without increasing the earcup size or weight. A patented baseplate chamber and high-tech, nonwoven layer manage the flow of air inside the earmuff to control how sound reaches the ear. Snap-in ear cushions make replacement quick and easy. Telescopic height adjustment remains fixed during use. Earmuffs are designed with a Noise Reduction Rating (NRR) of 30 for a high level of protection.