Loop pile carpets are available in two main types of yarn: 100% recycled or 100% virgin polypropylene.  Among these, polypropylene is considered more durable. Loop pile carpets come in a variety of neutral shades and provide excellent performance throughout your home, especially if you choose a low, densely woven loop. The lower the loop, the more durable the carpet will be. Loop carpet is a popular choice for high-traffic areas such as stairs, hallways, or other frequently used rooms