The 4mm thick polycarbonate board can withstand outdoor temperatures from -20℃ to 70℃, allowing enough sunlight to pass through and isolating most UV rays; the aluminum alloy frame with powder coating is more durable and won’t rust, and the panels allow up to 70% light transmission for optimal plant growth while blocking out over 99.9% of harmful UV rays. This walk-in greenhouse has high headroom, which provides a large volume for easy gardening and accommodating tall plants; it is suitable for various environments, such as the backyard, terrace, garden, etc., can hold enough plants and gardening tools to let you directly enjoy the fun of growing flowers, and it protects your plants from frost and excessive heat, creating a greenhouse effect to achieve the best planting results. The package contains detailed installation instructions with pictures, and each accessory is labeled with a number corresponding to the instruction; even though the greenhouse has a structurally upgraded design, you can still assemble this large winter greenhouse easily and conveniently. Its drainage gutter system can effectively drain water from the greenhouse to the outside.