I kicked a lot of roots and rocks on my hike and didnt feel a thing. The whole thing is designed to add no more than that. Bluetooth weaker than my grandmas knees. This is a really good ?house shoe?. sound quality is about what you would expect from this company--clean but not very loud. I will probably buy another pair soon just to have a back up. Kind of stupid if you ask me. Very disappointed as we continue to find black fuzz from shoes all over the house! Plus, the Macally wireless mouse is very reliable and comfortable. You do have to twist the flat piece slightly to get it to sit in the silicone properly.