Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
Of various forms, from the mere sandal (q.v.) to the complete covering of the foot. The word so rendered (A.V.) in Dt. 33:25, min'al, "a bar," is derived from a root meaning "to bolt" or "shut fast," and hence a fastness or fortress. The verse has accordingly been rendered "iron and brass shall be thy fortress," or, as in the Revised Version, "thy bars [marg., "shoes"] shall be iron and brass."