Yeti Skin

Location

The Yeti Skin mutation can be found in Mountain Pass. Southwest of Ted Yablonski's shack, and then down.

Cold: +8 - +10 
Chill Soaks: 100%

8-10 Cold Soak - This helps against Gulfhounds and Ghosts.
Offsets Chiller's Passive - Chiller mutants are rare, but those who do have the mutation can benefit from Yet Skin's increase in body temperature, which offsets the reduction from Chiller with +5°C to spare.
Cold Weather Protection - Yeti skin prevents mutants from needing to wear cold gear in cold weather. This is especially convenient for Flight mutants who don't want to mess around with wearing warm clothes as the Sky can be cold, same applies to Weezer Village.

Heat - Yeti skin enhances the heat of already hot areas. Summertime Coventry Island is particularly brutal for Yeti Skin mutants.
Replaceable - Environmental cold is very easy to guard against; wearing cold gear works just fine.
Cold damage is rare - Ghost and Gulfhound dodge is easy enough to dodge.

This mutation adds the following line to a character's appearance:

%P skin is thick and dusted with white fur.