Have a way to make ear molds that are individually fitted. Sending the mold material for use by individual who lets it dry and sends back for the final ear mold.
I have a Bose and although I can’t tell the difference between it and my old $5,000 hearing aid, I was recently told by an audiologist that if they fit me for new, expensive hearing aids, they will make an individual mold as well.
I have conductive hearing loss and continually blocked Eustachian tubes.