1 Samuel 17:5

A coat of mail. — More accurately, breastplate of scales. This armour has been sometimes understood as “chain armour,” but it is more probable that the Philistine armour was made of metal scales, like those of a fish, whose defensive coat was, no doubt, imitated at a very early date by this warlike race, who dwelt on the sea-shore, and whose life and worship were so closely connected with the great sea. This coat of mail, or corselet, was flexible, and covered the back and sides of the wearer. The weight of the different pieces of the giant’s panoply largely exceeds the weight of mediæval suits of armour.