The Skyspan 10 foot square umbrella has a solid powder coated structural aluminum frame with a rope and pulley gearing mechanism. The umbrella canopy is made from a PVC Coated polyester fabric which is both 100% waterproof and UV proof. The retractable umbrella range has been wind rated by engineers withstanding 37 mph. After many years of engineering and endurance testing, this umbrella that will surpass all expectations.