This patented technology provides two types of protection. Insert the olive end for a constant NRR of 22dB. This is especially suited to all high level noise and reverberation such as in an indoor range. With the yellow end inserted, the patented filter takes over to provide variable level protection for impulse noises without blocking normal communications such as range commands. Noise reduction increases with level for weapons fire above 110dB. (estimated NRR's from about 0 to 22dB).
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Submitted By: Christopher A. On 11/26/2014
I was issued a few sets of these earplugs while serving in the Army at Fort Drum, NY. I love the variable (yellow) side hearing protection. They did the job for the rifle fire on the range but you could still hear/understand instructions from the tower and range safeties. I prefer these to any other hearing protection issued.
Down sides to them are they're a little more prone to getting knocked out of your ears when removing a helmet because of how bulky the unused side is. Also, I wouldn't recommend switching between the yellow and green sides without cleaning the earplugs. The outward facing side is busy picking up dust/sand/dirt while you're wearing them.
[4 of 5 Stars]