The form factor is extremely sensitive to the contours of your ear canal. For instance, the hearing aid in my right ear rests quite firmly in place, and despite the fact that I can run, leap, pull myself up, and so on and so forth, the hearing aid continues to remain firmly in place. A slight gap can be heard in the left ear. Even if I insert it very carefully and directly into the left ear, the sensation remains the same; nevertheless, after a while, the in-ear monitors start to move somewhat in the left ear. Although it is not essential, yet. As a result, using one's ears as a measuring device is strongly recommended whenever there is the possibility of doing so.
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