Constructed with thick powder-coated steel pole(1.9") and 12 heavy-duty steel ribs, VIBESPARK patio umbrella has good strength and durability. The outdoor umbrella's canopy is made of 100% polyester Fabric, and it is UPF50 certified to diffuse sunlight. A smooth-turning crank make you easy to open or close the large umbrella. This 14.5ft patio umbrella will provide an ample shade to keep you cool and protect from hot sun in the summer days. When you are not using it, the umbrella cloth has a rope that holds the umbrella cloth well. 3 vents on the top give you more coolness and safety because it allows airflow and reduce wind pressure.