VIVOSUN walk-in tunnel 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.On the outside, the durable and waterproof PE cover blocks most of the UV light, thus creating your plants a fine growing environment.We have also opened more windows to increase the ventilation rate.Don’t hesitate, let this green house help you with gardening!