These earmuffs are perfect for blocking noise up to 101 dBA, keeping your ears safe and sound. They're designed to be mounted on a cap, making it convenient to use with most hard hats. The ear cushions are filled with liquid and foam, ensuring maximum comfort. Plus, the earmuffs come in a variety of colours for easy compliance sighting. They have an NRR of 24 dB and are CSA Class approved.