Gomu Gomu no Mi/Gear 4 Techniques, One Piece Wiki

Gear 4 ("Gear Fourth") is a transformation technique that uses the power of the Gomu Gomu no Mi and Busoshoku Haki. It has multiple variations that enhance some amount of the user's defense, speed, and power beyond their normal limits. It was first seen in Luffy's battle against Donquixote Doflamingo. It was developed by Luffy during his training on Rusukaina. Luffy coats his arm in Busoshoku Haki before biting into his forearm. Similar to how he activates Gear 3, he blows an incredible amount o

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