You can survive even in the most extreme natural heat conditions.
Prerequisites: Base Fortitude save +6, Heat Endurance.
Benefit: You gain fire resistance 5. If you already have fire resistance, it increases by 5. You can exist comfortably in temperatures up to 160° F without having to make Fortitude saves (see Heat Dangers, page 12). Your protection against heat is level 3 (see Protection against Heat, page 14).
Source: Sandstorm, page 50.