Howard Leight by Honeywell Thunder Series T2 Dielectric Safety Earmuff (1010929) Dielectric construction inhibits conduction of electric currents; ideal for electrical environments but suitable for all workplaces Patented Air Flow Control technology reduces sound across all frequencies without increasing earcup size or weight; includes multiple attenuation levels Inner-ventilated headband provides extra breathability, even in humid weather; headband is non-deforming and offers uniform pressure for more comfortable long-term wear Quick-Click height adjustment gives you a custom fit that stays fixed in place all day long; snap-in ear cushions make cleaning, replacement and maintenance easy Noise Reduction Rating 28; Recommended industries: aviation, farming, construction, lumber, steel, transportation, military/law enforcement, manufacturing, sporting, DIY projects, general contracting