1 Samuel 17:5

17:5 He had a bronze helmet on his head and was wearing scale body armor. The weight of his bronze body armor was five thousand shekels.

sn Although the exact weight of Goliath’s defensive body armor is difficult to estimate in terms of modern equivalency, it was obviously quite heavy. Driver, following Kennedy, suggests a modern equivalent of about 220 pounds (100 kg); see S. R. Driver, Notes on the Hebrew Text and the Topography of the Books of Samuel, 139. Klein, taking the shekel to be equal to .403 ounces, arrives at a somewhat smaller weight of about 126 pounds (57 kg); see R. W. Klein, 1 Samuel (WBC), 175. But by any estimate it is clear that Goliath presented himself as a formidable foe indeed.