When fighting with two weapons, your defenses are extraordinarily strong.

<php>echo “<b>Prerequisites:</b>”;</php> Dex 19, Improved Two-Weapon Defense, Two-Weapon Defense, Two-Weapon Fighting, BAB +11
<php>echo “<b>Benefit:</b>”;</php> When wielding a double weapon or two weapons (not including natural weapons or unarmed strikes), you gain a +3 shield bonus to your AC. This bonus stacks with the shield bonus granted from weapons with the defensive property. When you are fighting defensively or using the total defense action, this shield bonus increases to +6.