Trusted since 1992. For adults & kids. Softer! Water protection series. Free case! Hear for life! Tested according to ANSI Specs S3.19-1974. The level of noise entering a person's ear, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Example: 1. The environmental noise level as measured at the ear is 92 decibels dB(A). 2. The NRR is 25 decibels (dB). 3. The level of noise entering the ear is approximate 67 dB(A). Noise Reduction Rating: 25 Decibels (when used as directed). The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness). Made in the U.S.A.