The 9 x 15 ft. professional grade patio shade is built with 180g of environmentally friendly fluoride-free polyester fabric, UPF 50 + rated sun protection effectively blocks 99% of UV rays, and color fastness level can reach American standard level 4 for long term use without fading. Supported by 12 reinforced umbrella bones, the umbrella covers up to 135 sq. ft., and the innovative ventilation design on top promotes air circulation to keep you comfortable even for multiple parties. The Market Patio Umbrella comes with a heavy-duty cast iron base, two sandbags, and a dust cover for overall solid and reliable construction, making it an ideal shade choice for patios, decks, and poolside.