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These are a nice plugs, much better than the usual foam for comfort and frequency balance.
But they have to fit properly. As an example, I need a standard tip in my left ear, and a large one in my right ear.
The only practical way to find out what fits is to try and see, one reason Etymotic offers a Standard+Large 2-pack. (This drop is NOT that combo).
FYI, there's also an ER-20XS product with a fatter resonating chamber. Performance is rated the same, but they sit pretty deep in the ear canal. Those will run you $20 at Amazon, or $25 for a pair supplied with 6 tips in three styles for more fitting options.