I agree with the others, get some of the cheapies for now..Wife and Idid the custom ones that are molded to you ear..I like those..Sounds funny but I can hear the stereo better..
That is when I am wearing my half helmet...I started wearing a 3/4 with a face shield and have a tough time withthem..if they move around you can't adjust them unless you take the helmet off...Some information on this web site that might help...
Hearing loss will sneak up on you before you know it...Funny, none of the guys I ride with wear a helmet or use ear protection...Guess I'm the odd ball in the group...
http://www.azearprotection.com/motorsports.htm