Ive done the shake test and they stay pretty well in there. I think Im the 1st reviewer on here talking about these so just goes to show great products being drowned in a sea of mediocrity. Its also great that it is 18W and charges so fast. Based on some of the reviews I did get my street size (5) and it fit with some pulling but way to small. These, it only activates voice control, which I dont find super useful. They are really nice and comfortable. Lost one star because a piece was cracked on arrival, but I didnt notice until after assembly and it doesnt seem like it compromises the stability at all so Im keeping it vs exchanging. They are lightweight, comfortable, and easy to clean with a hose and some dish soap. 5 and was afraid the 7 would be too small so I went up to an 8. They get interference and audio breaks up occasionally.