GALVANIZED STEEL DOUBLE ROOF: W12ftxL20ft(144inchx240inch), Fade-resistant and rust-resistant galvanized steel top, keeps out bright light and harmful UV rays, strong enough to withhold windy or heavy snow. which is not possible with traditional soft top gazebos.DOUBLE-ROOF DESIGN: The double top of the gazebo has a built-in mesh in the middle to increase air circulation,while repelling mosquitoes to provide you with a safe environment.ALUMINUM FRAME TO RESIST FADING AND RUST: 4 corners are reinforced to form a triangular frame to improve durability and safety.The gazebo with pre-drilled bases is designed for all kinds of uneven ground and can be installed in different outdoor situations.