You can defensively roll to evade attacks.
Prerequisites
Dex 15, Dodge, Mobility, Acrobatics 6 ranks.
Benefit
Once per round, you may attempt to evade an attack against you by making an Acrobatics check. The result of your Acrobatics check replaces your Armor Class against that attack.
If the attack misses, you may choose to take a 5-foot step as an immediate action. This 5-foot step doesn’t count against your limit of one 5-foot step per round or against any movement you take on your turn.
You may not use this feat if you are considered flat-footed.