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I'm thinking of getting some of these for flying (Helicopters), my helmet has hearing protection but the high freq turning noise still penetrates and I'm finding increased hearing issues and occasional tinnitus. I now wear disposable foam earplugs under my helmet but they muffle the coms to a near useless level.
Any comments on how these fare against high frequency noise? Custom fit earplugs don't maintain a seal when I don my helmet, so maybe these would be a good middle ground?
I just looked at their site (which is entirely in chinese, use chrome to auto-translate):
perfect self in a moderate noise environment, the ability to want to eliminate unwanted high frequency noise without sacrificing maintain situational awareness. Perfect round
for the self-employed in high-noise environments while moderate to want to eliminate unwanted high frequency noise to keep communication skills (500-2000hz). The red filter is for those looking for a tiny step in decaying from our standard green filter.
Here's the website: http://www.elcustom.com/Website/technology/
Note the graph at the bottom http://www.elcustom.com/Website/images/attenuation_vs_human.png
But I have no idea if this drop has this technology in it, if the "Red" is the "Heavy Metal" etc.