What is the difference between each type of rug fiber?

"Wool - Wool is an extremely versatile fiber that dyes easily, so you’ll find an almost endless array of color options. Luxurious and durable, it can stand up to high traffic areas. Cotton - This super soft fiber also comes in a rainbow of colors. Cotton is casual looking, reasonably-priced, and often machine washable. A great choice for busy families. Jute/Sisal - Jute and sisal are extremely durable. Which is why you’ll find them sporting textures and weaves that other fibers simply can't deliver. Silk - Usually combined with other materials such as wool, silk naturally has a silky soft feel. These exquisite fibers also give the rug depth and create a luxuriant sheen. Nylon - The limitless colors this fiber offers won’t limit your imagination. It’s also durable, resists dirt and scoffs at crumbs. Which is why nylon gets high marks in high traffic. Polypropylene - Also called olefin, this durable performer is affordable, holds color well, and repels both stains and moisture. That’s why it’s even suitable for use outdoors. Polyester - Another durable option, polyester is not known to bleach or fade easily. So it can definitely stand up to kids and pets crawling around on it."