The Rugged Northerner feat from the Inner Sea World guide allows the character to treat cold conditions as one category less, from extreme to severe, severe to cold, and cold to it's-not-really-that-bad-out. The Heart of the Snows alternate racial trait from the Advanced Race Guide also allows a character to do the same.
So if you have both, does only one apply, or do both? Could Sonja really be running around in her chain-mail bikini in sub-zero temperatures and not feel the sting?
