This 18 foot Skyspan cantilever umbrella features a solid powder coated aluminum frame with a retractable winding mechanism. The heavy duty umbrella canopy is made from PVC coated polyester fabric with is waterproof and UV proof. The retractable umbrella range has been wind rated by engineers withstanding 75 mph. After many years of engineering and endurance testing, this umbrella that will surpass all expectations. Perfect for providing shade for your picnic tables or benches.