Review on ER20XS Motorsport High-Definition Earplugs by Etymotic Research - Under Helmet Noise Reduction, Standard Clear Stem with Frost Tip by David Golden

Probably the best $25 I've ever spent on motorcycle gear. The ear tips fit my ears perfectly and work much better than the 3M foam ear tips I've used before. First, etymotika are much easier to insert, and the sound is much better: not muffled, just quieter. I've also found that these dampeners help improve bass when listening to music (which is usually absent due to the difficulty of making helmet speakers that make good contact with the listener's ears without causing discomfort). I'm not sure why this is happening as their plot of attenuation versus frequency is more or less flat. My unscientific guess is that the buds sticking out of my ears act as a kind of acoustic conductor between the speakers and my ears, actually bringing the speakers closer to my ears. on the neck is not very good. I mean, it's strong enough not to break, but it knots itself and tends to slip off one side, so I'm afraid of losing it one day. If it were thicker and had some kind of resinous anti-slip coating, it would work a lot better for me. I think I can just use something else.