Needs review
Source: Cityscape

Description: You have learned to use new techniques and modifications to your armor to increase its protective ability.

Prerequisites: Heavy Armor Proficiency

When you wear light or medium armor, you gain 1 more point of armor bonus to your AC than your armor normally provides. For example, a suit of studded leather would have a +4 armor bonus, rather than a +3. However, because you must adjust, and customize the armor to more effectively cover weak spots it is also slightly more encumbering, increase its armor check penalty by 1. You are not required to make use of this feat. you decide when donning the armor whether you wish to don it normally or with this feat in effect.

Special

A fighter may select Efficient Defender as one of his fighter bonus feats.