Premium PE Cover: Reinforced with double-stranded edge banding, this cover is exceptionally tough and durable; The waterproof white PE material not only shields against harmful rays but also withstands harsh weather conditions, ensuring excellent solar performance Sturdy & Durable Framework: Supported by a powder-coated heavy-duty steel frame, the green house is very sturdy and firm; Burying the base into the ground enhances its stability and safety Crafted Details: The rolling entrance door on one side ensures easy access and ventilation; Heavy-duty zips on roller shutters are precision-made and durable; For added convenience, braked wheels allow for easy movement and secure positioning Lightweight & Space Saving: Equipped with four deep shelves designed for seedling starting trays or pots, this unit saves space on your balcony; Enjoy the convenience of starting seedlings indoors before transplanting them outdoors Easy to Assemble: One person can easily assemble it by following the included instructions; All parts are removable, portable, and reusable, allowing you to move the greenhouse around with the seasons VIVOSUN green house is supported by a heavy-duty steel frame. Even in undesirable weather, it will always be a warm harbor for your plants. Also, the frame is galvanized, strengthening its ability against rust.