The reason I bought this particular area rug is the fiber content which is Polypropylene.  I live in High humidity Florida, and I am using the rug on my screened patio.  There were other rugs that I liked better, but they had cotton backing.....this rug is 100% polypropylene, which is better for my climate.  I have grown very fond of the rug though, and it does color match with my wicker chair cushions very well.