This garden polytunnel greenhouse from Outsunny comes with an integrated tunnel composed of durable PE cloth over a high-quality steel pipe frame. Thanks to solar energy, polytunnels with the door can maintain a consistent temperature inside that is ideal for plant growth. This large, heavy-duty walk-in greenhouse is an ideal way to extend your growing season while managing your plants in the garden polytunnel and protecting them from cold. It has one large opening adjustable roll-up window on each side of the tunnel greenhouse for cross ventilation on hot days and also drains away water and reduces pressure on the greenhouse outdoor frame. The greenhouse is constructed with a heavy-duty galvanised steel frame in a stable build, resistant to rust, corrosion, chipping and peeling. Two extra supporting rods add this polytunnel large stability and make the greenhouse tunnel more stable.