Silk has a soft, light texture which makes it an excellent material for intricately designed and elaborately patterned area rugs. Made of a natural protein fiber spun by silkworms or caterpillars, silk is five times stronger than steel and twice as strong as Kevlar. It is sleek to the touch and widely used for floor coverings and wall hangings. Despite its strength, silk is easily stained and not recommended for high-traffic areas. Silk is often blended with stronger, more elastic wool to increase durability when used in making rugs, such as Persian and Oriental rugs. With its luster and shine, silk is the most expensive rug fiber. These rugs should be handled with care and should only be cleaned by a professional rug cleaner. Silk rugs are an attractive and elegant investment for any home décor.