This manufacturer uses only yarns that meet their highest quality standards. Their fibers include wool, nylon, and polypropylene. They use only 100% two-ply textured polypropylene. This type is made exclusively for them. This very special and unique process enables the yarn and rugs to assume a wool-like appearance. Most braided rug manufacturers use recycled non-woven materials as fillers. They use only synthetic fiber yarns knitted into a tube. The two ends of the filler act as a firming agent around which the surface yarns are entwined. Not only is filler non-absorbent, but it also provides relaxation so the rug will always lie flat. The filler is a built-in cushion for a softer underfoot feeling. They use Clear, a high-quality monofilament thread, which exceeds industry standards for strength and durability. These 100% textured polypropylene rugs are true indoor/outdoor braided rugs. The polypropylene yarn and sewing thread used allows for the rug to be sunray resistant. The knitted filler also allows the air to flow through the rug thus making the rug dry quicker if wet, and be more flexible for outdoor use. The wider and closer the stitching is, the longer life and wearability the rug has.