Cold Endurance( Frostburn, p. 47)
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.
Base Fortitude save bonus +2,
Improved Cold Endurance (Fr) ,
You can exist comfortably in conditions between 0Â° F and 90Â° F without having to make Fortitude saves (as described in Cold Dangers, page 8). You also gain a +2 bonus on saving throws against cold effects. Cold Endurance doesn't provide any level of resistance to cold damage.