Heavy Duty Steel Frame: Heavy duty steel construction in a galvanized finish, which is resistant to rust, corrosion, chipping and peeling. The greenhouses for outdoors are also equipped with 4 slant bracing tubes, front cross bar and middle reinforced tubes for enhanced stability. Large Walk in Greenhouse 8 Roll-Up Side Window: The eight roll-up windows of the green houses for outside have netting to allow for cross ventilation and climate control while keeping pests and other threats out. Roll-Up Front Entrance: A large zipped rollup door provides easy access to the inside and can be attached to the top in order to stay open. You can easily anchor the outdoor greenhouse tent into the soil. Added stability with 4 screw stakes, 4 rods and overlong cover. Note: Please put away the cover in case of heavy snow, strong wind, and heavy rain.