Agile Armor
Armorcommon
This magically enhanced armor is less bulky than its nonmagical version. While wearing a suit of medium agile armor, the maximum Dexterity modifier you can add to determine your Armor Class is 3, instead of 2. While wearing a suit of heavy agile armor, the maximum Dexterity modifier you can add to determine your Armor Class is 1, instead of 0.
Source: Vault of Magic · OGL-1.0a · 5.1