Perks provide the player with extra benefits like faster hands, decreased explosive damage, faster running ability, immunity to tactical equipment, and even the ability to remain invisible to UAV and Scorestreaks.
Perk Tier 1

Lightweight
Move Faster.
Unlocked: Default

Low Profile
Invisible to UAVs, Tracking Rounds, and Exo Ping.
Unlocked: Default

Flak Jacket
Take less explosive damage. Cancel frag cooking with weapon switch. Reset fuse when throwing back frags.
Unlocked: Level 9

Overcharged
Increase Exo Ability battery life. Concuss nearby enemies with boost slams.
Unlocked: Level 25

Danger Close
Do more explosive and Scorestreak damage.
Unlocked: Level 39
Perk Tier 2

Peripherals
Increase mini-map coverage. Take out enemies without displaying their death location.
Unlocked: Default

Blind Eye
Undetectable by Tracking Drones, Explosive Drones, and all Scorestreaks except the UAV.
Unlocked: Default

Cold-Blooded
Immune to Thermal, Target Enhancer, Threat Grenade, and enemy call outs. No name or reticle color change when targeted.
Unlocked: Level 15

Gung-Ho
Fire while sprinting and sliding.
Unlocked: Level 31

Fast Hands
Reload while sprinting. Swap weapons, use Exo Abilities, and use Exo Launcher faster.
Unlocked: Level 43
Perk Tier 3

Hard Wired
Immune to System Hack, EMP, Nano Swarms, Stun Grenades, and Scramblers. Scorestreaks remain vulnerable.
Unlocked: Default

Toughness
Flinch less when shot.
Unlocked: Default

Blast Suppressor
Invisible on mini-map when performing Exo moves.
Unlocked: Level 2

Scavenger
Start with extra magazines and resupply bullet ammo from fallen enemies.
Unlocked: Level 35

Hardline
Decrease Scorestreak cost by 100.
Unlocked: Level 47