Thanks for the link. I'll check it out.
The best earplugs I have had are those ones where they inject a silicone mix into your ear canal to take a mold. Its amazing how one ear canal can have a very different diameter and shape from the other (a bit like rabbit holes...). Unfortunately, after 2 years, they split (soft silicone). The guy who made them had moved out of Auckland, so I couldn't get new ones made.
I went to the University of Auckland Audiology Department, who made up a similar set of plugs, but they were never any good. I don't think any of the researchers were motorcyclists.
In the end, I went back to using my old rubber ear plugs. (They actually work quite well.) They're a lot more effective than the expanding foam rubber ones.




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