Wool is the most commonly used animal fiber. The fiber is obtained from the soft, hairy covering of sheep and sometimes goats. Under the microscope, the wool fiber looks like a long cylinder with scales on it. The advantages of wool is that it can keep you warm by trapping air between its fibers, and will allow moisture to evaporate through the fabric, keeping you dry. But wool fibers weaved into clothes or rugs are relatively expensive as compared to synthetic wool.
Synthetic fibers cost much less, and resist staining because of their smooth surfaces which are apparent in this specimen.