What are you trying to hear?
If you have a helmet system for hearing your radio of communication system then I could see wearing hearing aids. I take mine out and put them in their carrier.
Hearing Aids cost too much.
I take out my aids, and put in container. I once on a rainy weekend ride lost a hear aid :bangheadafter I went into a restaurant and then forgot to take them off. It was a long wet ride, I showered at Motel, and then went out to eat. I put aids in to hear server but when I got out I was tired, 2 days of rain (500 miles).
Next morning I came out to bike, there was one aid, other? I was lucky they were new and only cost me $250 to get them replaced. I now make sure they are off, in the case, and in the case. Plugs then go in my ears.
I am sure with all the Ipods, smart phone, etc. hearing aids will become a device many more people will be wearing them. I just hope cost comes down of aids, these seem to be one of the electronic items that do not come down in price.