The thermal insulation of the feathers is quite good, especially the dense down feathers near the base, which have even better insulation properties. Perhaps this is why a snowy continent like Antarctica accommodates a small population of the Feathered Tribe. With their large wings wrapped around them, it's like having a natural down jacket, which other species' fur struggles to match.
Especially the Feathered Tribe who have lived for generations in Antarctica, their down feathers are more developed, making their wings fluffier and thicker. In addition, the Feathered Tribe's elemental affinity is inherently high, and most possess casting abilities that can resist severe cold. Coupled with the equipment provided by the Silan Royal Family, they are hardly affected in temperatures as low as mid-negative Celsius.
