1 Samuel 17:5

And he had an helmet of brass upon his head, and he was armed with a coat of mail; and the weight of the coat was five thousand shekels of brass.

Helmet of brass. The Philistine helmet had the appearance of a row of feathers set in a tiara, or metal band, to which were attached scales of the same material, for the defense of the neck and the sides of the face.

A coat of mail - a kind of corslet, quilted with leather or plates of metal, reaching only to the chest, and supported by shoulder straps, leaving the shoulders and arms at full liberty.