currently, all armor has 3x the durability. I'm thinking, that the triple durability buff should be applied, only if you're wearing armor meant for your class. IE: casters, wear leather to get the triple durability buff. rogues, leather and some chain, healers, all but cleric leather and chain, warriors, iron and some diamond.
if wearing more than one piece, the durability gets bumped to 4x (doesnt stack per piece, maximum 4x).
if wearing more than one piece, the durability gets bumped to 4x (doesnt stack per piece, maximum 4x).