Mobility( Player's Handbook v.3.5, p. 98)
[Fighter Bonus Feat, General]
You are skilled at dodging past opponents and avoiding blows.
Dodge (PH) , DEX 13,
Bounding Assault (PH2) , Combat Archery (CW) , Combat Archery (ELH) , Elusive target (CW) , Improved Flyby Attack (ELH) , Improved Flyby Attack (SS) , Improved Low Blow (Rac) , Improved Whirlwind Attack (ELH) , Low Blow (Rac) , Mighty Leaping (SS) , Mobile Defense (ELH) , Rapid Blitz (PH2) , Roof-Jumper (Ci) , Roofwalker (Ci) , Shot on the Run (PH) , Sidestep (MH) , Spring Attack (PH) , Whirlwind Attack (PH) , Wolfpack (RW) , Mighty are Fallen (DC) , Shi`Quos School (DrU) , Xaniqos School (DrU) , Roofwalker (RD) , Psionic Sidestep (Web 3.0) , Improved Psionic Sidestep (Web 3.0) ,
You get a +4 dodge bonus to Armor Class against attacks of opportunity caused when you move out of or within a threatened area. A condition that makes you lose your Dexterity bonus to Armor Class (if any) also makes you lose dodge bonuses. Dodge bonuses (such as this one and a dwarf's racial bonus on dodge attempts against giants) stack with each other, unlike most types of bonuses.
A fighter may select Mobility as one of his fighter bonus feats (see page 38).