Cold Endurance( Secrets of Sarlona, p. 115)
Either because of growing up in a cold environment or training your body and mind to ignore the biting effect of cold, you can exist with ease in low-temperature environments.
Base Fortitude save +2,
You can exist comfortably in temperature conditions of 0 F and higher without having to make Fortitude saves (MM 302). You also gain a +2 bonus on saving throws against cold effects.
Cold Endurance doesn't provide any level of resisÂtance to cold damage.