There are three options for the back of short haircuts for men - blocked, rounded, and tapered. The blocked nape is cut straight across in a defined line. In contrast, the tapered nape gradually transitions from the length of hair at the back of the head, fading into skin along the natural hairline.
The taper can start high, up above the ears, lower down, as shown above, or anywhere in between. This finishing is flattering for short or thick necks, adding the appearance of length and slimness.
Another benefit to going with the tapered neck is that it grows out neat and clean compared to the rounded and block napes. Most barbers or stylists will give a free touch up between haircuts so there’s no excuse for a scruffy neckline. This is especially true for the shaved sides of the undercut.