Enjoy leisure time with your family and friends under the shade! Our 15ft twin patio umbrella with air-vented design offers a large shading coverage. Besides, the patio umbrella comes with sturdy metal structure and sun-protective fabric, which can ensure high durability and protection. And the bottom base is constructed with a crossed metal frame, 2 sand bags (a filled sand bag weighs 90lbs) and an external cover, so you don't need to buy an enhanced base additionally. Furthermore, this patio umbrella features user-friendly crank mechanism that helps you to open and close the umbrella in a few seconds. In a word, our patio twin umbrella is perfect for outdoor use, such as backyard, garden and poolside