Ninja Tabi

Ninja Tabi would allow you to double jump and would make parkour and scaling mountains easier. You could craft them with two gold, two iron, and a potion of leaping. You would also have a 1/20 chance of finding them in villages. You could give them the enchantments, unbreaking, and jump boost that would make your jumps higher. The Tabi would also negate almost all fall damage. The Ninja would make combat and exploration way easier.