“Breastplates are the most common type of armor mentioned in the Book of Mormon. Most passages simply mention the use of breastplates and therefore offer no details as to their structure or material. Breastplates were said to protect the wearers from enemy weapons—‘shielded from the strokes of the Lamanites by their breastplates’ (Alma 43:38; 49:24)—but they could nonetheless be penetrated—‘they did pierce many of their breastplates’ (Alma 43:44). Breastplates were known to the Jaredites, at least in the last phases of their civilization (see Ether 15:15)” (Hamblin, “Armor in the Book of Mormon,” 407).