Upon the unification of Upper and Lower Egypt by Pharaoh Menes, the two crowns were combined both elements into a single crown in 3100 BCE. The Upper Egypt crown was a white cone with a serpent in front, while the Lower Egypt crown was a red cap with a tall straight crown in back and a spiral crown in front.

Additional Information:

• Royal Crowns – Ancient Egypt
  The Double Crown was a combination of the Red Crown of Lower Egypt and the White Crown of Upper Egypt. It symbolised the joining of the two lands, and the pharaoh’s control over the two lands. The Blue Crown (the Khepresh) was a blue cloth or leather headdress decorated with bronze or gold discs.
• Crowns of Egypt & Headdreses of Egyptian Gods *** – Land of Pyramids
  The different styles of the royal crown of Egypt all had meanings, some were worn … Crown and represented a unified Egypt, a combination of the red crown and …
• Crowns of Ancient Egypt, An Introduction – Tour Egypt
  For kings, the number and variation of crowns grew over time. … identities of various gods were sometimes merged with others, a certain crown primarily worn by …
• The Pharaoh’s Double Crown of Egypt – ThoughtCo
  Apr 6, 2019 – The Symbolism Behind the Double Crown of Egypt. Pschent Combines White and Red Crowns for Upper and Lower Egypt. Share; Flipboard …
• The royal crowns of Egypt | Egypt Exploration Society
  Mar 7, 2019 – Explore the royal regalia of the Pharaohs of Ancient Egypt and maybe … This crown is a combination of both the Deshret and Hedjet crowns …