1、27db Noise Reduction Rating: This helmet earmuff has a 27db noise reduction rating, providing superior hearing protection and helping to complete a comprehensive above the neck safety system. 2、Ergonomic Headband: This helmet earmuff features an ergonomic headband with soft padding that reduces pressure on the head for superior comfort. 3、Spacious Interior: This helmet earmuff has a spacious interior that ensures breathability, while the soft faux leather provides a tight acoustic seal. 4、Hat Block Design: This helmet earmuff features a hat block design for easy use with helmets with attachment slots. 5、Wide Application: This helmet earmuff is suitable for general industry, manufacturing, repair and maintenance, construction, oil and gas, forestry, shipbuilding and mining.