Unlike some others that I use regularly, the earcups have very little resistance when you need to fold it up. I use to spend so much money at the salon waxing. Im certain my experience is unique in this regard and I would not be concerned about a shifting phone if you are considering this unit. The guy who posted before me saying that it was the same as any other car wash is just plain wrong. Can distort at higher volumes, but a nice unit overall. After thinking about it for a while, I couldnt understand how a facility could have something on "freezing" that no one else knew about so I gave Isavera a shot. Definitely order to your usual size Unless you gaming on your phone I dont see how you would need more. And dont worry if they feel a little tight at first, its part of the genius design of them. These are truly the most underrated slides.