The 15ft patio double-side umbrella provides an ample shade to keep you cool and protect from hot sun. This umbrella made of thick steel pole and quality polyester, which is antirust and waterproof that great for outdoor use. It is worth mention that this patio twin umbrella comes with a rugged base, which weights can up to 220 LBS when filled with sand. The extra large double-sided design also matches your desk and chair and provides more shade area. You can easily use the crank to turn it on or off which is not only laborsaving but also safe. When you are not using it, the umbrella cloth has a rope that holds the umbrella cloth well. Vents give you more coolness and safety because it allows airflow and reduce wind pressure. Assembly is easy and can be done without the aid of tools. Specifications Color: Tan Material: Steel, Polyester Umbrella Dimension: 15 Ft x 8 Ft (WxH) Base Dimension: 28.5"x28.5"x29 (LxWxH) Net Weight: 38 LBS Rib Number: 12 Air vent: Yes Package Includes: 1 x patio double-sided umbrella 1 x Umbrella Base 1 x instruction Note Please refer to the dimension and size of the product before purchasing.