Don't worry, it's SmartStrand. SmartStrand is the only rug fiber with built-in stain resistance that will never wear or wash off. In addition to its superior durability, SmartStrand is crafted from renewable corn resources. The production of the fiber requires less energy and emits less greenhouse gas than other manufactured rug fibers. This no fuss eco-friendly fiber makes a wonderful addition to any room and is sure to endure within most lived in areas.

　　- 100% Dupont

　　- Rug gripper recommended and extends the life of your rug, prevents shifting and sliding and protects hardwood flooring from scratches

　　- Machine made in USA

　　- Stain and fade resistant