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Thank you for contacting Sony. The WH-CH720N does not have an official Noise Reduction Rating. This is because NRR is a specific certification for industrial hearing protection equipment, whereas these are consumer headphones designed for entertainment. While they feature our Integrated Processor V1 to effectively cancel ambient noise for a better listening experience, they are not rated for use as safety gear in high-decibel environments. We appreciate your interest in Sony products. Should you require any further assistance, please don't hesitate to reach out for support here: https://us.esupport.sony.com/support/s/support-contact?language=en_US&category=headphones Best regards, Gus, Sony North America Customer Support
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