The L3N Neckband Leightning® Earmuff offers maximum protection with a contemporary design and now features Air Flow Control Technology. It offers a sleek, anatomic behind-the-head design and can be used with facesheilds, visors, hard hats, and other personal protective equipment. The L3N Neckband Leightning® Earmuff has a NRR rating of 28. Sold in a case of 20 earmuffs.