Hearing Protection
Hearing protection devices decrease the intensity of sound that reaches the eardrum.
The effectiveness of hearing protection is reduced greatly if the hearing protectors do not fit properly or if they are worn only part time during periods of noise exposure.
Manufacturers generally provide information about the noise reducing capability of a hearing protection as an NRR (noise reduction rating) number.
The human aspects of hearing protection are particularly important since the only useful kind of protection is the protection that is actually worn.