Equines have hair, not fur. Although there is no distinction between hair and fur, a horse’s coat is referred to as hair because it is not dense enough to be used as clothing.
Horse hair has multiple important uses. It shields the horse from the elements, such as wind and cold, and maintains its body temperature. Additionally, hair protects the horse’s neck vessels and repels mosquitoes. It also plays a role in the production and transport of pheromones.
There is a summer coat and two winter coats on horses. One of the winter coats is short and bulky, while the other is comprised of long hairs that provide air pockets for insulation.