Ifrit Jambe it's a special technique that utilizes the strength of the exoskeleton obtained from the manipulated lineage factor combined with trained muscle strength, speed and Color of Armament Haki. it's special feature are the blue-white flames that surpasses that of "Diable Jambe" and is the pinnacle of Sanji's current kicking techniques

Edit
As pointed out by one of our best scholars, Runji does not have blue flames, the flames are officially blue-white in color.
https://worstgen.alwaysdata.net/forum/threads/flame-power.57099/#post-5419499
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