5% reduced Damage taken
Armour received from Body Armour is doubled
1.5% of Total Physical Damage prevented from Hits in the past 10 seconds is Regenerated as Life per second 
Unbreakable is a notable Ascendancy passive skill for the Juggernaut that grants life regeneration, damage reduction, and doubles the amount of armour the user receives from the equipped body armour. It also grants life regeneration based on the amount of physical damage that was mitigated from hits.
If the user also has Iron Reflexes, any evasion rating bonus from the body armour (which gets converted to armour) will NOT be doubled.
Petrified Blood's damage spread mechanics do not count as mitigation, and therefore do not contribute to "prevented damage".