Super Soft! Trusted Since 1992 Super Soft Foam High NRR 32dB 8 Pair Value + Free Case Hear For LifeTested according to ANSI Specs S3.19-1974The 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: The environmental noise level as measured at the ear is 92 decibels dB(A). The NRR is 32 decibels (dB) The level of the noise entering the ear is approximately 60 dB(A).Noise Reduction Rating 32 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)