You have developed a familiarity with particular sets of armor that allows you to prevent some damage from your enemy’s blows.
Prerequisites: BAB +6, Armor Focus
When wearing armor in the weight class selected for Armor Focus, you gain DR 1/-. This stacks with any other damage reduction of the same type, such as the armor being made of adamantine, or granted by class abilities or racial traits.
Special: You may take this feat multiple times. Its effects do not stack. Each time you take this feat, you apply it to a different weight class of armor.