The Polaro is built on an extruded aluminium frame with a cross beam on the roof for added strength. The aluminium is coated with baked-on enamel paint (white or beige) that will neither rust nor peel. The 22-ounce mould-treated vinyl canvas has a lifespan of 15 to 18 years and remains installed year round without any maintenance required. Its vinyl panels are heat-sealed together to make the canvas that much more efficient. The Flash System, our patented non-lacing fastening system, allows you to apply the optimal canvas tension to the frame. For best results, remove all curtains, screens and doors for the winter season.