I have been using elacin ER15 earplugs ever since my turbo prop days and now in the leftseat of a 737 they seem to come out perfect as well, it filters out the noise so you can understand any conversation. even when doing the walkaround, standing under the apu. they go in when i enter or approach the a/c and out when walking back to the crewroom.
no hearing loss what so ever!
its worth investigating. and cheaper than those NA headsets.
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