Blue, or sky-coloured; but here you must not understand the mere colours, which could not be offered, but some materials proper for the work, and of the colours here mentioned, to wit, wool, or threads, or some suchlike things, as appears from Hebrews 9:19, and from the testimony of the Jews. Fine linen, which was of great esteem in ancient times, and used by priests and great officers of state. See Genesis 41:42 Revelation 19:8,14. Goats hair; Heb. goats. But that their hair is understood, is apparent from the nature of the thing, and from the use of the word in that sense in other places.
Related Commentaries of Exodus 25:4
Exodus 25:4
4 And blue, and purple, and scarlet, and fine linen, and goats' hair,