Armor Focus

Proficiency with selected category of armor, base attack bonus +1.

Choose one category of armor: light, medium, or heavy.

While wearing armor of the chosen category, increase the armor bonus and maximum Dexterity bonus of the armor by 1 and lessen the armor check penalty of the armor by 1.

If you have the armor mastery ability, you increase the bonus from that ability by +1 when wearing armor of the chosen category. This replaces the normal benefits of this feat.

You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new category of armor.