The ShelterTube Garage/Storage Shelter, 2" 5-Rib Frame, Green Cover 12 x 20 x 11 ft. has a DuPont™ Premium powder coated square, 15 gauge, structural steel frame that delivers wind and snow load strength and stability. The Ratchet Tite™ Tension System keeps the cover smooth and taut. Heavy duty, 9 oz. PSM ripstop polyethylene woven fabric is UV treated inside and out to stand up to the elements, and is 100% waterproof. Universal steel foot plates for easy and solid connection to ground anchors, cement or pony walls. Front and back zippered doors for easy-access drive-through capability.