Eritrea:

Traditional Eritrean attire is quite varied among the ethnic groups of Eritrea. In the larger cities, most people dress in Western casual dress such as jeans and shirts. In offices, both men and women often dress in suits. Traditional clothing for Christian Tigrinya-speaking highlanders consists of bright white gowns called zurias for the women, and long white shirts accompanied by white pants for the men. In Muslim communities in the Eritrean lowland, the women traditionally dress in brightly colored clothes. Only Rashaida women maintain a tradition of covering half of their faces, though they do not cover their hair.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". Who are the only women who follow the tradition of covering half of their faces, though not their hair?
Rashaida women