高速で蹴りを放つ「ゴムゴムのスタンプ」の強化版。「エニエス・ロビー編」で初使用。In Equipment 4, Luffy's system proportions shift dramatically, precise to the exact sort he is getting. In all sorts, he gains darkish rings all over his eyes, as well as a level of Busoshoku Haki coating over no less than his arm