: Covering his arms in Armament Haki to provide structural rigidity.
: Biting his forearm and blowing air directly into his muscular structure. gear 4th
In the chronology of the One Piece narrative (Oda, 1997-Present), protagonist Monkey D. Luffy consistently overcomes physiologically superior opponents by innovating within the limitations of his rubber-based physiology. Following the two-year timeskip (Chapter 598), Luffy unveiled Gear Fourth during the confrontation with Donquixote Doflamingo (Chapter 784). Unlike previous gears that modify the skeletal or vascular system, Gear Fourth injects compressed air into the musculature of the arms and torso, coating the expanded surface area with Busoshoku Haki. This results in a paradoxical form: a highly elastic, pressurized balloon-like body capable of delivering devastating, rebound-based kinetic strikes. : Covering his arms in Armament Haki to
Since you didn't specify a specific game, I have broken this down into the two most common gameplay scenarios. This results in a paradoxical form: a highly
(Gear Fourth) is a powerful combat transformation used by Monkey D. Luffy in the One Piece manga and anime. It was first introduced in his fight against Donquixote Doflamingo (Chapter 784/Episode 726). This technique involves Luffy inflating his muscular structure by blowing air into his forearm while his body is coated in Busoshoku Haki (Armament Haki), allowing him to combine high-tension rubber elasticity with extreme physical hardness. Core Variations
Unlike Gear 2nd (blood flow) or Gear 3rd (bone inflation), Gear 4th focuses on . Luffy activates this by: