Armor has all the properties of Things, although it may have additional properties from Extensions:
Hit Locations [Extension]: Numerical indicators of what part or parts of an Actor the Armor protects.
Damage Types [Extension]: Adds a separate Damage Type stat block that provides different armor protection vs. specific types of damage (Slashing, Crushing, Piercing, Cold, Heat, etc.)
Piecemeal Armor [Extension]: Creates the possibility of having different types of armor on each of an Actor's Hit Locations.