The animal known for producing the warmest fur is the Arctic fox. Arctic foxes have a thick, luxurious double coat that provides excellent insulation against extreme cold temperatures in their native Arctic tundra habitat. Their fur changes seasonally; in winter, it becomes white or pale to blend in with the snow, while in summer, it shifts to brown or gray for camouflage in the tundra landscape. This insulating fur allows Arctic foxes to withstand temperatures as low as -58 degrees Fahrenheit (-50 degrees Celsius). The adaptability of their fur is crucial for their survival in one of the harshest climates on Earth.