וְנָ֨שְׂא֜וּ אֶת־יְרִיעֹ֤ת הַמִּשְׁכָּן֙ וְאֶת־אֹ֣הֶל מוֹעֵ֔ד מִכְסֵ֕הוּ וּמִכְסֵ֛ה הַתַּ֥חַשׁ אֲשֶׁר־עָלָ֖יו מִלְמָ֑עְלָה וְאֶ֨ת־מָסַ֔ךְ פֶּ֖תַח אֹ֥הֶל מוֹעֵֽד׃
they shall bear the curtains of the tabernacle, and the tent of meeting, its covering, and the covering of sealskin that is above upon it, and the screen for the door of the tent of meeting;
Rashi on Numbers
את יריעת המשכן THE CURTAINS OF THE TABERNACLE — the ten lower ones,
Tur HaArokh
ומכסה התחש אשר עליו, “and the covering of Tachash hide which was over it, etc.” Ibn Ezra writes that the verse abbreviated the description, omitting reference to the covering consisting of the ram’s hides dyed red, which also covered the Tabernacle. (Compare Exodus 36,19) Some commentators believe that both of these coverings were glued to one another so that they formed one cover.