Cap-mounted earmuffs feature a durable, steel-wire construction to offer 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. Earmuffs are designed with a Noise Reduction Rating (NRR) of 27 for a high level of protection. Included pair of hard hat adapters allows easy installation to a wide range of hard hats..