Is that category not already dominated by the limitless croakie-style bt headphones on amazon for cheap? You can probably find a waterproof pair too. I mean if the sound quality is nothing to write home about, all you are really paying $160 for is to stick them in a chic box.
For the "lightweight, minimum BT-connectivity fuss, no wires, BT earbuds" category, which they basically kick-started and dominate.