Extra Large Shade: 15 ft rectangle patio umbrella provides larger shading area up to 140 square feet shade area when fully open，generously shades 8-12 person seating areas. Ideal for family gatherings, outdoor dining or relaxing, it can provide ample shade area for your family and friends. 3-Tier Ventilation: Triple-layer canopy outdoor umbrella provides substantial air circulation which provides much more stability than 1 or 2 tier umbrellas under windy conditions. In summer months, the breathable 3 tier roof allows heat to pass through quickly. Durable Frame: Built with a powder-coated steel pole and 12 rust-proof steel ribs, this outdoor umbrella provide optimal support for the large double-sided canopy. Even better, safe latch design for better-fixed canopy. (always use with proper base). Crank Mechanism: This market umbrella is designed for easiest control, Smooth opening and adjustment, simple assembly required. With the integrated crank Lift, you can open and close the umbrella smoothly. TIPS: Please take down the outdoor umbrella during strong wind or rainy days. Guarantee and Service: We have a professional after-sales team, if you encounter any problems, you can contact us, and our customer service team will reply to your email within 24 hours. And we provide a one-year promise. We will do our best to solve your problem to your satisfaction. Specifications: Overall Dimensions: 15‘’ x 9.12‘’ x 8.4'' Pole Diameter: 1.9 inches Material: Polyester, Steel Canopy Shape: Rectangle Fabric: 180g polyester cloth Canopy Size: 15 ft x 9.12 ft Umbrella Height: 8.4ft Steel Ribs:12 Ribs