Outsunny 3 x 2M Reinforced Walk-in Polytunnel Garden Greenhouse Steel FrameLarge walk in greenhouse: Heavy duty greenhouse is an ideal way to extend your growing season while easily managing your plants in garden polytunnel and protecting them from coldDrainage circulation function: 1 Large opening adjustable roll up window on each side of the tunnel greenhouse for cross ventilation on hot days and drain away water and reduce pressure to the greenhouse outdoor frameGreen PE cover: Fully closed waterproof UV resistant PE