Winter's Child

 
Prerequisite(s): Raised in an Artic Terrain.
 
Benefit: As an arctic dweller, you are more hardy. The DC of your Fortitude save to avoid subdual damage from cold is reduced to 10. In addition, you can make a saving throw each minute (DC 10, +1 for each previous check) to resist the effects of hypothermia in very cold water.
 
Source: Savage Species