How thick is a fur?

The thickness of fur can vary greatly depending on the species of animal, the climate in which it lives, and the time of year. In general, fur is thickest in cold climates and during the winter months, when it provides insulation against the cold. For example, the fur of a polar bear can be up to 4 inches (10 cm) thick, while the fur of a lion living in a warm climate may only be a few millimeters thick.