The white crown worn by the pharaohs of Upper Egypt is called the hedjet.
The hedjet was the royal crown associated with Upper Egypt, the southern region of the Nile Valley. It is usually shown as a tall, bulb-shaped white crown that narrows toward the top. Its exact construction is unknown because no surviving example has been found; proposed materials include felt, leather and woven plant fibres.
The crown appears in early royal imagery, including the famous Narmer Palette, where the ruler wearing it is identified with the South. Later kings used the hedjet in scenes presenting themselves as rulers of Upper Egypt and as successors of the falcon god Horus.
After Upper and Lower Egypt were unified, the hedjet was combined with the red crown of Lower Egypt, the deshret. Together they formed the pschent, or double crown. That is why the hedjet is sometimes confused with the pschent: the former is the white Upper Egyptian crown alone, while the latter represents both lands.