'Breastplates' in the Bible

Meanwhile, somebody drew his bow aimlessly and struck the king of Israel between the scales where his armor breastplates joined, so he instructed his chariot driver, "Turn around and take me out of the battle, because I've been severely wounded."

They had breastplates like iron, and the noise of their wings was like the roar of chariots with many horses rushing into battle.

This was how I saw the horses in my vision: The riders wore breastplates that had the color of fire, sapphire, and sulfur. The heads of the horses were like lions' heads, and fire, smoke, and sulfur came out of their mouths.