ARMOR SPECIALIZATION
Type: Combat, Tier 2.
Prerequisite: Proficiency (Light Armor), Armor Focus.
Benefit: While wearing armor that benefits from the Armor Focus feat, you gain DR/magic equal to half the armor's armor bonus (including enhancements). If you already have DR/magic from another source or if the armor is magical, you gain DR/adamantine instead.

IMPROVED ARMOR SPECIALIZATION
Type: Combat, Tier 3.
Prerequisite: Proficiency (Light Armor), Armor Focus, Armor Specialization.
Benefit: While wearing an armor the benefits from the Armor Focus feat, you gain DR/- equal to half the DR/adamantine you get from Armor Specialization.

GREATER ARMOR SPECIALIZATION
Type: Combat, Tier 4.
Prerequisite: Proficiency (Light Armor), Armor Focus, Armor Specialization, Improved Armor Specialization.
Benefit: The DR/adamantine you get from Armor Specialization increases to the full armor bonus instead of half. Consequently, this increases the DR/- you get from Improved Armor Specialization as well.