Needs review
Source: Frostburn

Description: Either because of growing up in a frostfell or training your body and mind to ignore the biting effect of cold, you can exist with ease in low-temperature environments.

Prerequisites: Base Fort Save +2

Required for: Improved Cold Endurance

You can exist comfortably in conditions between 0° F and 90° F without having to make Fortitude saves. You also gain a +2 bonus on saving throws against cold effects. Cold Endurance doesn't provide any level of resistance to cold damage.