Minecraft wiki entry for Armor, associated text: Note: Only one form of protection can be applied to a piece of armor (i.e. a chestplate cannot have both Fire Protection and Blast Protection, unless using commands to get all protection enchants in one piece of armor). Feather Falling, Frost Walker, Depth Strider and Soul Speed are enchantments applicable only to boots. Respiration and Aqua Affinity are enchantments applicable only to helmets.