Do you mean that grippy wire poking out so folks can pull the aids out at day’s end?
I guess if younger folks really wanted “invisible” aids the ideal design would be stark white AirPods dangling outta the ear. EVERYONE under 35 seems to have them in their ears. I can’t help but wonder if they muffle ambient noise at all, or why anyone would want these dangling out where they can just be extruded from the ear canal (like my aids) and end up falling on the ground someplace.