Made from the most powerful substance on earth - an alloy of adamantium, vibranium, mithril, and unobtanium. Plot armor can make its wearers invulnerable to all but the most minor and sexy injuries. Impress your friends and family with the secret to your improbable good fortune and inexplicable abilities.
Warning: if your name is Mary Sue or Gary Stu, you may find this shirt a bit redundant. May cause monologuing in evil geniuses, mad scientists, and megalomaniacs.