Adorable animal families that will make you aww. Wool is the dense, warm coat of sheep, also called a fleece. The hair of sheep has many unique properties that make it well suited to textile production, something humans realized approximately 8000 BCE, when sheep first began to be domesticated.Wool is used in a variety of textiles and can be found woven or knitted.ost 20. It's important to remember when washing wool garments to use the gentle cycle and cold water. Warm water might cause the wool to shrink. Also, it can be tempting to put the wool garment in the dryer on the delicate setting, but this is a bad idea.