Focused Breathing is an aiming gear perk that lets you hold your breath longer while aiming. It steadies your scope for longer, which helps long-range shots.
You can keep your breath held for longer while scoped in. That gives you more time to line up a headshot before the sway comes back.
Good for snipers and marksman rifle users. Close-range players will barely use it.
Headshot Focus and Major Steady Aim round out a precision loadout.