Xtremely High NRR 33

Noise Reduction Rating 33 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.

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.