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Armor Pieces and Proficiency

Source Ultimate Combat pg. 198
If you are proficient with an armor category, you are also proficient with the armor pieces of that category. For example, if you are proficient with light armor, you are proficient with all light armor pieces. Some torso armor pieces (such as chain, plate, and agile plate torso armor pieces) are a category lighter if worn alone (treat as a chain shirt, breastplate, and agile breastplate, respectively).

When a character is wearing at least one armor piece of a type with which he is not proficient, he takes the armor check penalty of that piece on attack rolls and on all skill checks that involve moving. If he is wearing more than one armor piece of a type with which he is not proficient, he takes the worst armor check penalty from among the pieces he is not proficient with on attack rolls and on all skill checks that involve moving.

Archives of Nethys

Rules Index | GM Screen

Armor Pieces and Proficiency