"Gear 4" (Gear Fourth) is a transformative combat technique used by , the protagonist of One Piece . It was first introduced in Chapter 784 , titled "Gear Fourth," during the climax of the Dressrosa Arc. The Mechanics
. By blowing massive amounts of air into his muscles—rather than his bones—and coating them in heavy Armament Haki, Luffy creates a pressurized state that gives him explosive "tension". Boundman (The All-Rounder): The first form we see. It’s bulky, bouncy, and allows Luffy to "fly" by kicking the air, mimicking the CP9’s Moon Walk. Tankman (The Ultimate Defense): Used primarily against Cracker, this form turns Luffy’s belly into a black hole of rubbery defense that counters attacks with double the force. Snakeman (The Speed King): Sacrifices defense for pure, unpredictable speed. Luffy’s punches accelerate every time they bounce off the air, making them nearly impossible to dodge. The Cost of Absolute Power Every "Gear" comes with a drawback, and Gear 4 is particularly brutal. It demands a massive amount of
The landscape of One Piece battles changed forever in , titled "Gear Fourth." Written and illustrated by Eiichiro Oda, this chapter marked the first full reveal of Monkey D. Luffy’s most powerful (at the time) transformation during his climactic duel with Donquixote Doflamingo on the Dressrosa plateau. gear 4 chapter
First released on , Chapter 784 remains one of the most iconic chapters in the Dressrosa Arc. After Gear 2 and Gear 3 failed to significantly damage Donquixote Doflamingo, Luffy was forced to reveal a technique he had developed during his two-year training on Rusukaina.
This is the core innovation. Luffy coats his inflated muscles in Busoshoku Haki . "Gear 4" (Gear Fourth) is a transformative combat
Gear 4 is a hybrid of Luffy’s previous concepts and Haki mastery.
The balanced form. It offers high defense and incredible power but forces Luffy to constantly bounce on the ground. By blowing massive amounts of air into his
Doflamingo was arrogant. He believed his Haki was superior. However, Gear 4 introduced a terrifying new variable:
Maintaining the Haki coating on such a massive scale while maintaining the air pressure requires an absurd amount of energy. Luffy mentions early on that he can only use this form briefly because it drains his Haki rapidly. Once the timer runs out, he becomes vulnerable and unable to use Haki for 10 minutes (the famous "Haki recharge" period).
While Chapter 784 only shows "Boundman" (Bounce Man), it sets the precedent that Gear 4 is a , not a single form.
Luffy inflates his muscle structure rather than his bones (Gear 3), giving him massive physical proportions.