Hair is sewn horizontally or vertically across the head from one side to the other starting from the bottom, which can help to prevent the hair from being bumpy or uneven. Then, the braided hair is sewn down, and the hair weft extensions are sewn onto the braids. A weave consists of a few tracks, or the whole head can be braided for a full head weave. With a full head weave, the braids are sewn down or covered with a net. Next, extensions are sewn to the braids. In general, the number of tracks used depends on the desired look.