The white masks sumbo poa  also known as "masks of fabrics" belong to the griots of the  Bereba village: the Bihoun family. These white masks made out of fabrics, the peaks of which are richly decorated with cauris, only dance at night under the moonlight.  Very spectacular, their energetic and acrobatic dances are accompanied by the tiohoun xylophone, drums and a chorus of women.
The appearance of the masks gives rise to joy and unchains body movements (anarchistic dances, disordered movements) and emotional feelings (enthusiasm, excitement) which highlights well the very nature of "festival" that the return of the Do divinity on the ground embodies. The latter is sent by the supreme god Dobweni to the men in order to become a link  between Dobweni and the forces of nature.