Parallel
Numbers 4:6
Brenton's English Septuagint · Berean Standard Bible
And they shall put on it a cover, even a blue skin, and put on it above a garment all of blue, and shall put the staves through [the rings].
They are to place over this a covering of fine leather (note: Possibly the hides of large aquatic mammals; also in verses 8, 10, 11, 12, 14, and 25; see Exodus 25:5.), spread a solid blue cloth over it, and insert its poles.