American Dakota core rugs are made from premium nylon, manufactured in American Dakota's exclusive EnduraStranTM fibers. The yarn system is fade resistant, antimicrobial and commercial grade tested for heavy traffic. The yarn cleans easily with water eliminating the harmful effects of chemicals. The rugs are made from premium quality continuous filament nylon. By utilizing "EnduraStran" fibers our rugs will not wear out or crush like Polypropylene.