The material below is Open Game Content from a 3PP Source
Mobility (Combat)
You can easily move through a dangerous melee.
Prerequisites: Dex 13, Dodge.
Benefit: 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 stack with each other, unlike most types of bonuses.
The material below is Open Game Content from the System Reference Document.
MOBILITY [Combat]
Prerequisites: Dex 13, Dodge.
Benefit: 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 stack with each other, unlike most types of bonuses.
Special: A fighter may select Mobility as one of his fighter bonus feats.