Deflect Arrows

 
Prerequisite(s): Dex 13+, Improved Unarmed Strike
 
Benefit: You must have one hand free, holding nothing, to use this feat. Once per round, if a ranged weapon would hit you, you may make a reflex check at DC20 to deflect the weapon. If the item is enchanted the bonus is added to the DC. You must be aware of the attack. Boulders, ballista projectiles and spells like acid arrow, cannot be deflected.
 
Source: Players Handbook