ShelterLogic Garage-in-a-Box Rountop, Grey, 12 x 20 x 8 ft. 1-3/8 in. / 3,1 cm all-steel frame, bonded with thermoset premium powder-coated finish prevents chipping, peeling, rust and corrosion Advanced engineered triple-layer ripstop polyethylene cover is waterproof, UV-treated inside and out with added fade blockers, anti-aging, antifungal agents resulting in a fabric cover that withstands the elements Patented ShelterLock stabilizers ensure rock solid stability, delivers a stable, more durable shelter Ratchet-Tite cover tensioning system ensures a drum tight cover and door-panel connection to shelter frame. Quality ratchet and web strap components keep cover tight and neat looking Easy Slide Cross Rail system locks down the cover and provides for continuous cover tightening