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, due to the One-Tailed Shukaku's desire to survive. The shield is capable of withstanding considerably strong attacks and projectiles, and can be hardened to a point where it's stronger than steel. Gaara can also completely surround himself in the shield to further increase his defensive capabilities.

It can be defeated by avoiding it completely with extremely high-speed attacks, such as Rock Lee's superspeed taijutsu, or merely overcoming the shield with incredible brute force, like Sasuke's Chidori.