Sunglasses that also act as personal audio devices are a rapidly expanding category of tech. The start-up SND RAY has put its take on this concept up for crowd-funding on Indiegogo. It claims that this product has improved audio quality compared to its rivals in this space.
https://www.notebookcheck.net/SND-RAY-the-best-HiFi-bone-conduction-sunglasses-are-now-on-Indiegogo.490200.0.html