The Heavy Armor skill perks Well Fitted, Tower of Strength, Matching Set and Reflect Blows rely on the prerequisite that the character must have equipped all-heavy armor.
How do I know a body armor part is heavy armor? Are they identified as such or does it depend on the material used?
The description will tell you if the item is heavy or light armour. Refer to the image below. (The small, dark grey text just above and to the left of the item name)
It depends entirely on the materials used.
These are all the materials that are considered heavy:
Conversely, here are all the light armor types:
You can also check by examining the armor from your inventory. It'll say heavy or light.
