What is gear5 ?

Gear 5 enhances Luffy's rubber body properties, making him stronger and allowing him to fight more freely. Aside from having a rubber body, he can now transform the things around him into rubber, as seen when he deflected Kaido's Bolo (Blast) Breath by bending a piece of the ground and using it as a shield.
video buy Joygirl. https://www.youtube.com/watch?v=dbT3TzFxfqE