Boil Release (沸遁, Futton; Viz "Vapour Style") is one of the two advanced nature kekkei genkai of Mei Terumī and is made up of techniques that combine fire- and water-based chakra to create a powerful corrosive vapour capable of melting anything. The user is also able to control the range and level of the vapour's acidity. This technique is strong enough to melt Susanoo's ribs; an impressive feat, as Sasuke has stated that Susanoo is even more of an absolute defence than Gaara's Shield of Sand.