Add these onto the Parent Race
Ability Scores
Str +1
Cold Endurance
You gain resistance to cold damage.
Extreme Environment
The first time you would be required to make a saving throw against exhaustion in a day due to environmental effects (such as extreme cold, hunger, or loss of sleep), you can shrug off the effect, automatically succeeding on the saving throw. Once you use this trait, you must complete a long rest before you can do so again.