Red goblin air steppers (Neo)

Red goblin air steppers:

These leather boots are comfortable and waterproof.

On command, they can allow the user to take a step on air as if it were solid at a cost of 1mp for the first step, and double the last step's cost for each step after that until one full round has passed.

Standing still in the air on these boots costs 5mp per round.

They also provide a flat 15% movement speed boost to the wearer.

Reference
Chapter 73 "End Of Arc 1"