Behold the ER-6 Isolators, made by Etymotic Research. These earphones are one in the company's broad range of listening products, and are perfectly adapted to use by motorcyclists. Inserted directly into your ear canal like an ear plug, they cancel outside noise while putting phenomenal sound directly inside your head. They rest flush with your ear, so there's no irritating pressure and they don't snag when you take your helmet off. An alligator clip keeps the thin wire from fluttering in the breeze.