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, allowing large volume for easy gardening and tall plants, and it is suitable for a variety of environments, can be placed in the backyard, terrace, garden, etc., accommodating enough plants and gardening tools so you can directly enjoy the fun of growing flowers; 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; while the greenhouse is structurally upgraded, you can easily and conveniently assemble this large winter greenhouse. Its drainage gutter system can effectively drain water from the greenhouse to the outside.