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.SEPTLS1541011997. TLS1541011997. Howard leight by sperian Howard leight by sperian Leightning Earmuffs - 1011997.