This heavy duty giant 13 foot square Nova center post umbrella is long lasting and low maintenance. This quality umbrella has a winding handle system that is easy to use and a telescopic mechanism that opens and closes easily above furniture. The strong 2" x 1" reinforced canopy arms are connected to a 4" mast with six internal channels for extra strength. The canopy is water repellent and made of marine grade fabric that is made for a commercial environment.