some sort of audio system...

[beccaB]

Check with a snowmobile supplier. I know they make these for that purpose (or motorcyles). Not sure if they would work with bike helmets though.

Me? I don't think this would be a good option, 'cause then he would hear me cursing at him on our rides .

SheFly

I would hope it would be him cussing at me because I'm kicking his *%# up the hills!