From Pathfinder Lost Omens The Grand Bazaar, which isn't enabled.

Sealed Poppet

FEAT 5

You've reinforced your interior parts with sealant or other flame-retardant materials, protecting you from fire. You no longer have the weakness to fire from the flammable ability.

Special You can't take this feat if you're a stuffed poppet.

Pathfinder Lost Omens The Grand BazaarOGL