This is an intelligently designed gazebo replacement canopy top cover for most standard 12' x 12' two-tiered gazebos. This 12' x 12' polyvinyl top cover has a two-tier ventilated top construction. The top tier measures 36" x 36". The opening on the bottom tier is 30" x 30". Between the top tier and bottom tier is a functional mosquito netting that allows the replacement canopy to expand upwards and to allow wind gusts. This expansion capability allows this replacement canopy to fit two-tiered 12' x 12' (144" x 144") gazebos. The functional mosquito netting between the two tiers keeps annoying insects from entering through the top of the gazebo. The top tier attaches to the bottom tier with a custom designed velcro seam. Reinforced corners and easy Velcro attach tabs per side make it easy to install on existing gazebos. Brass grommet holes are built in for water drainage. This canopy does not have corner pockets for roof bars to be inserted (i.e., SunJoy). Fastening is provided by velcro straps. This canopy fits 12'x12' square gazebos only, not hexagonal gazebos. Now available in Beige. IMPORTANT GARDEN WINDS NOTE, PLEASE READ BEFORE PURCHASING: Garden Winds understands that there are over 40 manufacturers of similar looking 12' x 12' gazebos on the market, each with their unique designs and nuances in shapes and dimensions. Due to these differences, our replacement canopy may not fit properly on all 12' x 12' gazebo frames. We cannot guarantee that our canopy will fit your gazebo. We do however, offer a 100% full satisfaction guarantee. If our canopy does not fit your gazebo, return our canopy in sellable condition within 30 days, and we will gladly issue a refund less all freight charges. Return freight charges will be the responsibility of the customer.