Waterproof listening devices have always been wishful thinking, but never actually implemented correctly nor have had the demand properly assessed (lots of people
think they want them, but I'm not sure if they truly do)
Challenges I see:
- Cords get tangled really easily due to the nature of the sport (Solution - make them completely in ear)
- Bulkiness slows you down or at least presents issues when they fall out (see solution 1)
- There is no easy way to control volume or change the song (solution - perhaps use something in your mouth to "chew" on to change these parameters maybe?)
Swimming (especially the 3-4k I do almost daily) can be painfully dull, so the demand is sort of there, but it seems the amount of tech involved far outweighs the presumed benefit (and therefore demand).