Earmuffs are easier to use correctly, and therefore provide attenuation that is much closer to the laboratory derived NRR. Earplugs are hard or sometimes very hard to insert correctly, and therefore often do not provide the same attenuation in the field, as they do in the laboratory. This is the reason that NIOSH recommends different de-ratings for earplugs and earmuffs.

An earmuff may be preferable in the intermittent environment, while an earplug may be the choice in a long-term exposure. An earmuff may be preferred in a cold environment, while an earplug may be the choice in a hot and humid environment.

Most importantly, you should chose a protector that is comfortable and you should use it during the entire noise exposure.