You maintain constant vigil against the unexpected.
Prerequisites
Either Perception 3 ranks or Alertness feat.
Benefit
When you are subject to an attack while flat-footed or treated as flat-footed, you may make an Insight check (DC equal to the attack roll) to remove the flat-footed condition before the attack is resolved.
You may use this feat despite not normally being able to take immediate actions while flat-footed.