I use the Big Ears, they are built from a foam casting of your own ear canals.
Most of you are probably already aware that Arai (I do not know of other brands) have different thicknesses of pads to custom fit your individual head shape. This made a big difference in fit the for my wife and I. We both wear Arai Profiles but require different pad configurations.
I learned of this at a bike show a couple of years ago. The factory trained salespeople were very knowledgeable which resulted in a great fit, this is a much better approach than buying a helmet off the shelf at a dealership, but the helmets without ear protection are still too noisy for the two of us.
Hope I helped