ShelterLogic GrowIT High Arch Greenhouse with Heavy Duty Steel Metal Frame and Waterproof Ripstop Cover for Tall Plants, 13' x 20' x 12' Strong Steel frame: 1-5/8 inch heavy-duty Steel frame with Premium powder coat finish resists chipping, peeling, rust and corrosion Ripstop Tough: Triple layer, heat bonded ripstop translucent cover is waterproof and UV-treated inside and out. Designed specifically for plant growth and protection Plant Protection: Translucent fabric allows a significant amount of diffused light to reach the plants, while reducing the amount of harmful UV light. Diffused light reduces shadows and scorching to provide consistent lighting for all exposed parts of the plant, not just the tops High-Arch Reinforced Rafter Design: Bigger, stronger frame with reinforced roof structure adds more volume and strength Extend Growing Season: GrowIT fabric is a good thermal barrier providing good insulation for plants while preventing over-heating, which requires less water, ventilation accessories, and attention Easy Slide Cross Rail: System locks down the cover and squares up the frame Assembled Dimensions: 13 x 20 x 12-feet Total Storage Area: 258 square feet Includes: (1) 13 x 20 x 12-feet 6 rib all Steel frame, (1) translucent polyethylene cover, (2) Triple zipper doors, (12) bungee cords, (6) 15 inch auger anchors, (8) ratchet tie-downs, complete hardware kit, step-by-step instructions