I bought my SO a set of custom fit "musician" ear plugs a few years ago. She says they are very comfortable even on long rides. They are ported so she can hear normal conversation/headset perfectly but block out the wind noise. I don't recall where I got them (somewhere on the web) but they sent a mold kit and we went to a hearing aid store that helped us with that (charged us like ten bucks) and then sent the molds in and recieved her earplugs about ten days later. They cost about $130 if I remember correctly. Very small price to pay to protect your or your SO's hearing IMHO.