We all have different ear shapes, unique ear canals, and bone structure in the skull. They have a little flex to them so theyre not completely brittle. It comes with an auxiliary cable which allows you to use theme even when they are not charged. Finally, for musicians, theres a guitar 3. I also they fit perfectly for me! Well, to me, they feel exactly the same. I needed something with a little stickiness to stop that. I do have nerve damage to my right foot. I currently have a bike rack and a cargo box mounted on it fully loaded and its sturdy as a rock. The sound quality is very good, both in music reproduction, and in calls; and the other parties on the call report good quality from the microphone.