Armor Born (3.5e Feat)
From D&D Wiki
Armor Born [General, Fighter]
You are strong enough that armor does not restrict your movements.
Prerequisite: Base attack bonus 12, Heavy armor proficiency, Strength 22, Dexterity 20, Medium size or larger, Endurance
Benefit: The character no longer has a maximum dex bonus from their armor or shield nor an armor check penalty. Their speed is not hampered in heavy armor, and they are considered as wearing light armor regardless the type of armor they are currently wearing. If the character is a dwarf they gain +2 to their armor bonus.
Normal: The character has a maximum dex bonus from their armor and shield. They also has armor check penalties.
Special: Fighters can take this as a bonus feat