Stability

Stability
An armor, docent, robe or shield enhancement that grants the wearer a deflection bonus to AC and a resistance bonus to all saving throws if they are of True Neutral alignment.

Comes in either normal (granting bonuses of +2 to each), greater (granting bonuses of +4 to each), or superior (granting bonuses of +6 to each). Greater Stability and Superior Stability can only be found on named items.