Saw a friend's new iPhone 4s last night. Didn't recognize it at first, because of the thick, rubberized shell he had wrapped around it. Wondering what is "thi

Saw a friend's new iPhone 4s last night. Didn't recognize it at first, because of the thick, rubberized shell he had wrapped around it. Wondering what is "thin enough" and when people start to compensate to up durability or even just grip-ability. P.S. The shell, of course, had an extra hole in it to display the Apple logo. (Which I saw once he stopped performing data entry.)