Our Indoor and Outdoor Area Rugs are extremely durable and vivid in both color and detail. They help bring a pop of color from your favorite fish into your home. The main difference between the Indoor and Outdoor Rugs is the backing. The Indoor Rugs are a Polyester Chenille Face with a Coated Backing. The Outdoor Rugs are a Polyester Chenille Face with a breathable outdoor grade non skid coated backing that is water and mildew resistant for quick drying.