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Jackson Safety offers hearing protection and high-performance communication that's both comfortable and stylish. Earmuffs are designed in styles that can dampen both intermittent or constant high-frequency noise, while still allowing lower-frequency sounds through. Our earmuffs are designed to offer a competitive noise reduction rating (NRR), a measurement that indicates how much hearing protection a unit offers. NRR 29. Adjustable, soft padded headband adjusts to fit all head shapes and sizes. Headband construction keeps perfect pressure over head and ears. Special sound absorbing materials for efficient attenuation. Strong plastic cups with slim design help to withstand rough environments. Extra soft foam in the cushion rings for improved comfort.