The Cat NRR35 refers to a high-performance noise reduction rating (NRR) ear protection device. It is specifically designed to provide effective noise attenuation, rated at 35 decibels, which is among the highest levels available for hearing protection. This makes it suitable for use in extremely loud environments. The device is likely designed with comfort and durability in mind, featuring cushioned ear cups and a secure seal to help reduce sound exposure. It is often used in industrial settings or situations where superior hearing protection is crucial.