I was told a while back, that the wind noise at 80mph for half an hour is sufficient to cause a "partial shift in hearing" and too much of these and you'll permanently damage your hearing. At the time I was doing alot of very fast miles and would often have tinitus at the end of a ride. I started wearing soft plugs and the difference was unbelievable, I felt a lot better and less tired. I still use them if I'm doing motorway riding and only not wear them if I'm plodding about on short rides.
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