High-quality PVC Cover: It is double-stranded edge banding, making the cover tougher and more durable; The clear PVC cover can prevent harmful rays and bad weather while bringing good solar performance Sturdy & Durable Framework: Supported by a powder-coated heavy-duty steel frame, the green house is very sturdy and firm; Bury the base into ground helps you strengthen its stability and safety Crafted Details: Rolling entrance door on one side makes for easy access and ventilation; Heavy-duty zips on roller shutters are high-quality and durable; Brakable wheels make it easy for you to move around Lightweight and Space Saving: Comes with 4 deep shelves for seedling starting trays or pots, saving space on your balcony and giving you the convenience to start seedlings indoors before moving them outdoors Easy to Assemble: Easy for one person to assemble by simply following the included instructions; All parts are removable, portable, and reusable so you can move the greenhouse around with the seasons Vivosun green house is supported by a heavy-duty steel frame. Even in undesirable weather, it’s the warmest harbor for your plants. Also, the frame is galvanized, strengthening its ability against rust.