*The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. 3M personal protective equipment sold through Shop3M.com is only intended for US occupational workplace use. This 3M personal protective equipment must be used in compliance with the Occupational Safety and Health Administration (OSHA) Personal Protective Equipment (PPE) standard (29 CFR 1910.132) and all other applicable health and safety standards as well as all user instructions warnings and limitations accompanying each product. It is essential that all product user instructions and government regulations on the use of each product be followed in order for the product to help protect the wearer.