The adjustable volume helps with calls from people that are soft spoken, vs. They are thin but very warm and you can still hear just fine! I want to thank Aleksey for personally handling this problem. Ive been using this bike for about 3 and a half months with a Peloton Digital subscription and bluetooth sensors I added for speed and cadence. I purchased this shoe rack because it fitted into the small space I had. se escucha súper bien! They go below 30 Hz and you can "feel" it. So I paid $10 and exchanged it for the newer WONDERBOOM 2. One thing that could be better is better Alexa integration. After hearing a friends AfterShokz Air, I was impressed and decided that I needed to get these to try for myself.