Why do different materials make a big difference?

Originally, area rugs were made from wool or cotton. Today, you have a choice between several natural or synthetic fibers

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 So what's the best choice? It all depends on how much traffic the area receives, how easy the rug is to maintain and, of course, how much you're willing to spend.

•  Polypropylene/olefin ? The most stain-resistant synthetic fiber on the market today. Polypropylene repels water and is impervious to most stains. Usually less expensive than other fibers.  
• Acrylic ? Highly resistant to sunlight, stains and mildew. You'll mostly find acrylic fibers in bath mats and rugs.  
• Nylon ? Versatile, durable, easy to maintain and clean. Withstands heavy foot traffic.  
• Wool ? Dyeability, durability, softness and cleanability make wool the superior fiber. Wool is the standard by which all other carpet fibers are measured.