Horse's hair is composed of two parts: the MANE and the manes. The MANE is the long, thick hair that grows from the top of the horse's neck, while the manes are the shorter, thinner hairs that grow along the sides of the horse's neck. Both the MANE and the manes are important for protecting the horse's neck from the elements and providing insulation. Additionally, the MANE and manes can be groomed and styled to create a unique look for the horse.