I just got back from my 17,000 mile trip and had to post about the best piece of kit on my bike: My ER-6i ear buds from Etymotic.

They completely cut out the wind/motor noise as they're basically an earplug that you stick all the way in your ear that happens to have a high end audio driver built into it.

They're pricey, but worth it IMO. They're small enough to just barely protrude out of your ear they are comfortable under a helmet. The sound quality is amazing-- especially since it is sealed so well in your ear, you get pretty good bass response. My favorite part is because they keep the outside noise out of your ear, you don't have to have the volume up very high. This is better for your hearing in the long term and also provides longer battery life to your mp3 player (volume significantly effects life).

So the one disadvnatage of these is that there are these tiny little filters that go iside the bud-- these clog eventually and you have to replace them. What happens is that it just sounds like you broke your one ear bud and volume is significantly decreased. They come with 2 extras, but I quickly lost them upon purchase.

I emailed Etymotic that I needed new filters and rubber tips and they sent me 2 filters and 4 tips FOR FREE!!!!

I can't say enough good things about the build quality/design/function/customer service of these ear buds.

Wow, that was a positive review.. for the record, I have no connection with them.. no sponsership (well, they sent me free filters/tips, but they do that for everyone!).. I'm not dating anyone in marketing, etc
Product link:
Etymotic Research, Inc. - ER•6i Isolator Earphones

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http://davegtravels.com - RTW on a DRZ
All the way south - Texas to Tierra del Fuego in '08-'09