The Cobblestone - Gray Outdoor Rug by Treasure Garden. Treasure Garden gives your outdoor space the elegance of an indoor rug, but with the durability required for an outdoor environment. This rug is perfect for small chat sets and dining sets alike. They are made from 100% polypropylene, a material well known for its durability and soft comfort. Easy to clean and maintain, you'll love the unique appeal that this rug will offer to your outdoor space.