Synthetic yarns have come a long way! Any more, you have to get down on your hands and knees, and actually flip over the rug to determine its material. Polypropylene, polyester, and viscose are often used. The benefits of synthetic fibers are many: superior stain blocking, easy care, and resistance to fading. They tend to be the ideal choice for functional areas like entryways, hallways, or patios. This material can give the client a more cost effective alternative to a true silk rug.