In The Last of Us, Armor is used to protect wearers from enemy fire. They cover the user's body with a bulletproof vest and their head with a helmet. Many enemies wear armor, making them tough to defeat. Some infected are covered in thick fungus that acts like armor; this is most easily seen on Bloaters.
Throughout the game, many enemies encountered wear armor. Since they absorb most of the damage done from firearms, they require more gunshots in order to kill. However, melee attacks (including shivving and choking) ignore armor. Upgraded melee weapons, for example, kill targets in one hit, regardless if they have armor or not.
Certain weapons, such as the Hunting Rifle, have the power to penetrate armor and do more damage by selecting the armor piercing upgrade.
Runners are never armored; some wear a bulletproof vest, but this is for purely cosmetic purposes. Bloaters have thick fungus that act like armor, absorbing damage from gunfire. Unlike non-infected, they cannot be killed as easily by a melee weapon, due to their strength and thick armor, as it absorbs much more damage than a bulletproof vest.
A armored vest and helmet. Breaks when it takes too much damage.
— In-game description.
In Factions, armor is available for purchase. By default, armor costs 450 parts. The number of parts needed to purchase armor increases by 50 with each purchase. Costs are reduced if the player uses the Cheaper Armor One-Time Booster. Armor may be purchased as long as the buyer has enough parts and doesn't have a fully intact helmet and vest; purchasing armor always gives a fully intact vest and helmet, replacing the buyer's existing armor (if any). Armor carries on between lives as long as it is not destroyed.
Once purchased, armor consists of a vest and a helmet. Both decrease the amount of damage done to the player by 50% until they break. Both can break once they take a sustained amount of damage; they can also break independently of each other. While the vest is more likely to be useful as the body is a larger target than the head, the helmet protects the wearer from one-shot headshot downs from weapons such as the Hunting Rifle, El Diablo, and the Military Sniper. However, all these weapons completely destroy the helmet in just one shot, leaving the wearer vulnerable to follow-up shots. As in singleplayer, armor does not reduce damage taken by melee attacks and shivs. Armor still protects players even when they are downed, making it tougher for them to be finished off through gunfire.
Armor does not protect the wearer's legs and feet, making targeting the lower body a viable option against armor users. Although there are some character models that gain kneepads when they purchase armor, this is for appearances only; kneepads do nothing to protect users from damage, making it an ideal place to target when the opponent has armor equipped.
Helmets can be changed in character customization, as well as adding an emblem to their helmet for cosmetic value only; this does not change gameplay.