Gear 4 is Luffy's latest technique, called 'Boundman' or 'Bounceman'. In Gear 4, he blows air into his muscles, and hardens himself with haki. He's just as fast as he is in Gear 2, and by compressing his arms, retracting them into themselves, he can use the recoil to punch even harder than before. He can also use a similar technique with his legs, to fly. One other advantage is that his body is flexible even while shielded with haki.
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Island 4...
Metal Gear Solid 4: Guns of the Patriots
first i use my legs to pump blood to higher rates, then i have my metabolism to be so high, i sweat. then it evaporates, which is why i look like I'm steaming. my stance helps get the process to stabilize.