The Mole Mitts are an item featured in The Minish Cap. They are used to dig through dirt that otherwise would be unpassable.
The Minish Cap
The Mole Mitts are found in the Fortress of Winds behind a bombable wall. They are used frequently in the dungeon to dig up the dirt to access other parts of the dungeon and find chests. They are also used in the fight with the dungeon's boss, Mazaal to dig through inside his head to find his weak point. This same strategy is used to fight Vaati's Wrath.