Even though this is all over the board, here it is again:
When a virgin hair is allowed to grow from start to maturity, it ends in a tappered point on the end. This causes a bend in the hair, and reflects light in a certain way. Because of the changing thickness towards the end, the hair feels softer and until the hair reaches a certain length, it may not even be something you feel at all. It takes time for you to feel any coarseness.
Now, cut that hair, or shave that hair, and you have eliminated the tapered end. The hair has a blunt end, or a sharp point from the sideways slice of the razor. The thickness is uniform and the light is reflecting off a disk of hair at the end, instead of having less reflecting area on a natural point.
This hair will feel thicker, because it doesn’t have the natural bend found in a substance that tappers to a point (the smaller parts having a lower bend threshold than the thicker parts). This hair will feel harder to the touch because of the thickness on the end of the hair and the inflexibility of those non-tappered ends, and the light will reflect more noticeablly as well, making these hairs more noticeable, but still not different in composition. When they fall out of phase, they will regrow from the virgin state as they had previous to shaving.