There are two types of nylon fibers in the carpet industry. Nylon 6,6 is the premium fiber in the industry while nylon 6 is also a good option. Nylon 6,6 is the best wearing fiber you can buy. Names like Wear Dated, and Anso are all nylon carpet fibers. Typically, if you are buying a carpet with a face weight of 30 oz or less and want decent wear ability then your choice should be nylon. We highly recommend buying a nylon 6,6 fiber over any other fibers if you're looking for the longest lasting carpet.