Kit Contains: Protechs™ Sport Foam Ear Plugs, 100 Pair Adjustable Sleep Mask, 3 Masks Protechs™ Sport Foam Ear Plugs Great For: Sporting Events, Travel, Concerts Noise Reduction Rating NRR 33 Information required by EPA: The level of noise entering a person's ear, when a 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 dBA. (2) The NRR is 33 decibels (dB). (3) The level of noise entering the ear is approximately equal to [92 dB(A) - 33] 59 dB(A). The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness).
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