Above the inner sanctuary of the Tabernacle, outer layers were spread to shield the structure from the weather, particularly the rain [אבן עזרא]. Beyond mere protection, these layers served as a visual marker that identified the holy tent from a distance [קאסוטו]. The primary roof of the structure was formed by goat-hair panels [רש״י, שפתי חכמים, מלבי״ם, שטיינזלץ]. Traditionally, the uppermost covers rested entirely flat on this roof, spanning an area of thirty by ten cubits without hanging over the sides [רש״י, מזרחי, משכיל לדוד, בכור שור]. However, another perspective suggests they draped slightly over the edges to ensure they remained visible from afar [קאסוטו].
The materials used for this covering were distinct and deeply symbolic. The first material consisted of ram skins dyed a striking red [שטיינזלץ, קאסוטו]. Conceptually, the ram represents patience and the quiet endurance of hardship without complaint [אלשיך]. The second material came from the tachash, a pure, unique animal with a single horn that existed only during the time of Moses [רש ר הירש]. Ancient translations suggest that its skin featured a multitude of colors [אוהב גר, נתינה לגר]. Additionally, the root of the animal's name relates to speed, symbolizing an eagerness and quickness to perform the commandments of God [רש ר הירש, אלשיך].
Scholars debate exactly how these skins were assembled, a discussion rooted in varying descriptions throughout the Torah [ברכת אשר, משכיל לדוד]. The primary approach understands them as two entirely separate layers placed one on top of the other. After the red ram skins were laid down, a final layer of tachash skins was placed above them [רשב״ם, ביאור יש״ר, רש ר הירש]. The repetition of the instruction to make a cover emphasizes the existence of these two distinct layers [תורה תמימה, מלבי״ם]. It is also suggested that this uppermost tachash layer was not a permanent fixture, but was used specifically during travel to protect the structure while the camp was on the move [קאסוטו].
Conversely, another tradition maintains that there was only one single cover, crafted by sewing both types of skins together [רש״י, שטיינזלץ, בכור שור]. In this view, the instruction introduces a single cover and then simply details its combined materials [מלבי״ם]. The skins were not necessarily split evenly; rather, the tachash skins were used to fill in the gaps left by the ram skins [פרדס יוסף, מלבי״ם]. Following this approach, the direction to place the tachash skins above does not indicate a separate upper layer. Instead, it means the tachash skins, which were considered holier, were positioned at the highest point of the roof, directly over the Holy of Holies [העמק דבר].