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.
Halfling
Feat type
Ancestry Feat
Level
1
Traits
Halfling
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.
Source: Pathfinder Player Core, p. 60
Bring Unfettered Halfling into a Pathfinder 2e game with The DM Screen.