Two-Weapon Defense

Combat

You are skilled at defending yourself while dual-wielding.

Prerequisite: Dex 15, Two-Weapon Fighting.

Benefit: When wielding a double weapon or two weapons (not including natural weapons or unarmed strikes), you gain a +1 shield bonus to your AC. When you are fighting defensively or using the total defense action, this shield bonus increases to +2.

Source: Pathfinder Core Rulebook