I tried about every type of earbud you can think of. Conventional ones, I mean. Silicon bulbs, big ones, small ones. Some worked okay, some worked poorly. Twigg mentioned Shure 215K's, so I tried them. They are better quality, and provide far better sound and noise blocking, than anything else I've tried. They are more comfortable than any regular earbuds I've tried. The lead coming off the ear monitors has a sheath for the first few inches for durability (it looks like kevlar, but I don't know for sure). I use them pretty much daily under a Shoei or Nolan. When I fly, I take them with me because they block the ambient noise in the aircraft so much better than regular buds. Your mileage may vary.
https://www.fullcompass.com/product_image.php?imageid=98573
If you want to retain your hearing, plugs or phones with noise block properties are a must at highway speed (with the stock placebo windshield, even they may not reduce wind noise sufficiently, regardless of the helmet worn). I use Shure 215K monitors. They do a very good job of blocking wind noise, sound great, and in spite of the noise reduction and audio, I can hear a prius in the next lane.
I'm assuming you really like you're Sures? I have a set of Etymotic M5s, and they're kind of 'tinny.' My Sony buds sound vetter, but don't block noise as well. Thinking of trying the Sure buds.