Unfettered Halfling Feat 1
Source Pathfinder Player Core
You were either pressed into indentured servitude or shackled in a prison, but you've since escaped and have trained to ensure you'll never be caught again. Whenever you roll a success on a check to Escape or a saving throw against an effect that would impose the Grabbed, Immobilized, or Restrained condition on you, you get a critical success instead. Whenever a creature rolls a failure on a check to Grapple you, it gets a critical failure instead.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
HalflingA creature with this trait is a member of the halfling ancestry. These small people are friendly wanderers considered to be lucky. An ability with this trait can be used or selected only by halflings. A weapon with this trait is created and used by halflings.