Sealskin
From BiblePortal Wikipedia
Webster's Dictionary [1]
(n.) The skin of a seal; the pelt of a seal prepared for use, esp. of the fur seal; also, a garment made of this material.
International Standard Bible Encyclopedia [2]
sēl´skin : The rendering of the Revised Version (British and American) ( Exodus 25:5; Ezekiel 16:10 ) for תּחשׁ עור , ‛ōr taḥash , the Revised Version margin "porpoise-skin," the King James Version "badgers' skin." A seal, Monachus albiventer , is found in the Mediterranean, though not in the Red Sea, but it is likely that taḥash means the dugong, which is found in the Red Sea. See Badger; Porpoise .