pf2e.fyi
From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Winter's Kiss

FEAT 14
Archetype Gelid Shard

Whether in the heart of a volcanic passageway or the glacial tundras of the Crown of the World, the only temperature you ever personally experience is an oddly comfortable chill. You are now protected from extreme cold and extreme heat, and you gain resistance to fire equal to half your level. If you would already have resistance to fire equal to half your level from a heritage, ancestry feat, class feat, or another archetype feat, you instead gain resistance to fire equal to your level.

Pathfinder Treasure Vault (Remastered)ORC