I use the Slip from Slipstreamz [URL="http://www.slipstreamz.com/index.asp"] It holds the iPod earphone away from the ear. So you hear the music but can also hear what's going on around you. I have no problem hearing riders approaching from the back. It also blocks wind noise. As long as the volume isn't too loud on the iPod I can still hear everything around me. I take the earphones out if I'm going to be on the road or in heavy traffic or just turn the iPod off. Since they block wind they also help keep the ears a bit warmer.