You have trained extensively in heavy armor, and you have learned to take advantage of the protection it offers.
Prerequisites: Armor Proficiency (heavy), base attack bonus +4.
Benefit: When you are wearing heavy armor, lessen the armor check penalty of the armor by 1 and increase the armor bonus by 1.
Special: A fighter may select Heavy Armor Optimization as one of his fighter bonus feats.
Source: Races of Stone, page 141.