Despite their white appearance, polar bears have black skin. The fur of a polar bear is actually translucent, which means it only appears to be white because it reflects visible light. The black skin of polar bears helps them retain heat and keeps them warm in the harsh temperatures of the Arctic. The black skin also works as built-in insulation and helps them endure the difficult weather that surrounds them. The black skin of polar bears is most easily seen on their nose, lips, and foot pads.