A carpet is a soft floor covering made of bound carpet fibers or stapled fibers. Carpeting refers to wall-to-wall coverage, whereas a rug is simply used to cover a space. This type of flooring is typically used indoors and can be used in both high and low traffic areas. It typically lasts for 15-18 years before it needs to be replaced. The quality of a carpet is usually measured in face weight, or how many fibers there are per square inch. The higher the face weight the plusher a carpet will feel. Carpets come in a variety of materials including wool, nylon, olefin, and polyester. There are different types of carpet like twists, which are commonly referred to as a Berber. Twist carpeting is composed of multiple twisted fibers set into the carpet backing. It is typically used in low-traffic areas. Another type of carpeting is looped carpets, which are composed of looped fibers set into the carpet backing. This type of carpeting is typically used in high-traffic areas as it is easy to clean.