Perfect 10′ Offset Cantilever umbrella with a powder-coated aluminum pole, cross steel base & very sturdy frame. The umbrella structure consist of crank & Cantilever operation mechanism, you can open & close the shade via an easy-to-operate crank lift. Top air-vent that allows wind to flow through during windy days. The canopy is made of water resistant & fade-resistant polyester fabric which can be used in all year. Best choice for your backyard!