Flak Jacket

Flak Jacket is a Tier 2 perk featured in Call of Duty: World at War and a Tier 1 perk in Call of Duty: Black Ops, Call of Duty: Black Ops II, Call of Duty: Black Ops: Declassified, Call of Duty: Online, Call of Duty: Advanced Warfare, Call of Duty: Black Ops III, Call of Duty: Black Ops 4, Call of Duty: Mobile and Call of Duty: Black Ops Cold War. It also appears in the Call of Duty: Black Ops II campaign, where it is an item that can be obtained in multiple levels by using the Access Kit perk. It reduces damage to the player by explosives. It is similar to the Perk-a-Cola PhD Flopper in the Nazi Zombies game mode, as they both reduce explosive damage.

General Outfit
When the Flak Jacket is equipped it will give the character model extra heavy armor pads on his body resembling that of a Juggernaut. This will count towards all factions besides colors, faces and small details like a helmet. However, it should be noted that Flak Jacket does not make a player a larger target or any slower.