【Extra Large Patio Umbrella 】Our 15FT x 9FT large patio umbrella provides up to 135 square feet of spacious shade when fully opened. This 15 foot double-sided terrace umbrella is perfect for gathering with family and friends to enjoy the sun, making it an ideal choice for both family and commercial spaces 【Stable Umbrella With Base Included】 This umbrella comes with a durable umbrella base, cross base, and two sandbags and a cover cloth. It’s important to weigh the base down while in use, ensuring stability (sand not included). Each sandbag needs to be filled with 66 to 100 lbs of sand for optimal support 【User-Friendly Crank Design】 Enjoy hassle-free outdoor shade with our easy crank lift system for smooth opening and closing. This 15ft patio Large umbrella with base complements any patio furniture set perfectly and can also be used independently 【Superior High-Quality Terylene Polyester Fabric 】Our large outdoor umbrella is made of high-quality 100% polyester fiber, UV-resistant, waterproof, fade-resistant and breathable, providing you with shady and comfortable outdoor environment, ensuring it lasts through the seasons 【Sturdy & Durable Structure】This 15 foot umbrella features powder coated steel poles and 12 rust resistant ribs, enhancing durability. The diameter of the pole is 1.9 inches (48 millimeters), providing sturdy support for the components, and the top three ventilation openings ensure the stability of the terrace umbrella system 【Important Measurements Tips】The umbrella pole has a diameter of 1.9", and the base pole is 2.1". If you plan to use it with your own dining table, ensure the umbrella hole is larger than 1.9", and the fixed hole is larger than 2.1" for a proper fit