Miner Armor

Miner Armor is a armor set that is almost as powerful as Hardened Diamond inside mines, but very weak outside mines. This is not to be confused with Miner's Outfit, which is an armor set that gives you, and has a color of gray.

Despite the confusing name of this Armor, it does not help with the process of mining at all, besides giving bonus Defense in the Deep Caverns.

Obtaining
It has an extremely low chance of dropping from a Miner Zombie or Skeleton in the Diamond Reserve or Obsidian Sanctuary. If received from killing a Zombie or Skeleton from the Obsidian Sanctuary, it comes with Protection V.

Trivia

 * It used to drop with Protection II from Obsidian Sanctuary mobs, but it was changed to Protection IV and then changed again to Protection V because items with weak enchantments are deemed worthless by players (mainly because already enchanted items are not enchantable).
 * The defense bonus inside of mines is the number 255, which is the exact limit of 1 byte.