Tipis are easily raised and collapsed and are lightweight, which is ideal for nomadic people like the Crow who move frequently and quickly. Once collapsed, the tipi poles are used to create a travois. Travois are a horse-pulled frame structure used by plains Indians to carry and pull belongings as well as small children. Many Crow families still own and use the tipi, especially when traveling. The annual Crow Fair has been described as the largest gathering of tipis in the world. The most widely used form of transportation used by the Crow was the horse. Horses were acquired through raiding and trading with other Plains nations. People of the northern plains like the Crow mostly got their horses from people from the southern plains such as the Comanche and Kiowa who originally got their horses from the Spanish and southwestern Indians such as the various Pueblo people. The Crow had large horse herds which were among the largest owned by Plains Indians; in 1914 they had approximately thirty to forty thousand head. By 1921 the number of mounts had dwindled to just one thousand. Like other plains people the horse was central to the Crow economy and were a highly valuable trade item and were frequently stolen from other tribes to gain wealth and prestige as a warrior. The horse allowed the Crow to become powerful and skilled mounted warriors, being able to perform daring maneuvers during battle including hanging underneath a galloping horse and shooting arrows by holding onto its mane. They also had many dogs; one source counted five to six hundred. Dogs were used as guards and pack animals to carry belongings and pull travois. The introduction of horses into Crow society allowed them to pull heavier loads faster, greatly reducing the number of dogs used as pack animals. The Crow wore clothing distinguished by gender. Women wore dresses made of deer and buffalo hide, decorated with elk teeth or shells. They covered their legs with leggings during winter and their feet with moccasins. Crow women wore their hair in two braids. Male clothing usually consisted of a shirt, trimmed leggings with a belt, a long breechcloth, and moccasins. Robes made from the furred hide of a bison were often worn in winter. Leggings were either made of animal hide which the Crow made for themselves or made of wool which were highly valued trade items made specifically for Indians in Europe. Their hair was worn long, in some cases reaching the ground. The Crow are famous for often wearing their hair in a pompadour which was often colored white with paint.