Marvel: Insulated Weather Adaptation

Akihiro (Daken)
Daken's body is highly resistant to certain elemental extremes, particularly cold.

James Howlett (Wolverine)
Wolverine's body is highly resistant to certain elemental extremes, particularly cold, to the extent that he can sleep nude in subarctic conditions with no apparent injury.

Victor Creed (Sabretooth)
Sabretooth is able to withstand incredibly cold temperatures without sustaining bodily damage for great periods of time, even to the point of sleeping in sub-zero temperatures.