Outdoor Walk-In Tunnel Greenhouse Hot House with Roll-up Windows, Zippered Door, PE Cover 11.5' x 11285421Features: Protects crops from cold, frost, and hail in winter and stimulates growth in spring and summer Powder coated, reinforced galvanized steel frame resists water and warping UV blocking PE cover with a reinforcing grid to prevent tearing Four slant bracing tubes, middle reinforced bars, and front crossbars for enhanced stability Eight net protected roll up side windows for cross ventilation and climate control Zippered, netted roll up doors for