Shield of Sand

Whenever Gaara is about to come to harm, a shield of sand will automatically surround and protect him. The sand will react regardless of Gaara's will, even protecting him from self-inflicted injuries. This was first believed to be enacted by the One-Tailed Shukaku's desire to survive, although it was later revealed that Gaara's mother,Karura, had her love and will seeped into it. The shield is capable of withstanding considerably strong attacks and projectiles, and can be hardened to a point where it's stronger than even Raikage's Strength and the Gold Dust technique. Gaara can also completely surround himself in the shield to further increase his defensive capabilities. The shield is so fast that even Sasuke's Amaterasu failed to breach it, earning the name.

In Part I, The Sand Shield's power was considerable in speed and strength. However, it could have been easily defeated with extreme speeds and brute force, such as Sasuke's Chidori and Rock Lee's Hidden Lotus.

In Part II, however, The sand Shield showed a great increase in speed, to the point where it could guard against numerous Amaterasus, engulfing four previous kage instantaneously and countering the Raikage, clad in Lightning Release Armour. It's strength also increased to the point where it guarded against Raikage's Power kick and The Fourth Kazekage's Gold Dust technique.

Trivia

 * Despite that Shukaku is the source of this technique, this and other techniques remain with Gaara even after having it extracted from him. Though it is very likely that the technique is no longer automatic.