Metal armor serves as a very heavy armor. It provides much more protection than a suit of leather armor, but is more ramshackle than combat armor and is weaker than power armor. It can be very useful for someone who has Jury Rigging since it can be used to repair most types of power armor.
The metal helmet is similar in shape to a motorcycle helmet. It provides moderate protection for a piece of headgear and has a stronger variant, the metal helmet, reinforced.
xbox360 When holding metal armor outside of the pipboy (via pressing down L3) when jumping the metal armor will freeze mid-air and vanish. It won't disappear, and will be invisible. To avoid this, it is advised to pick it up again. [verified]
pcps3xbox360 Despite the fact that the metal helmet does not in any way cover the mouth when worn by a female character, it still muffles the character's voice as though it did. [verified]
xbox360 If the armor's condition hits 0 and the armor is old while equipped, there will be a permanent stat decrease to agility shown in the pip-boy as "Metal Armor -1 AGL". [verified]