Double Protection: The 140 GSM PE cover on this tent greenhouse maintains high humidity levels and protects plants from UV scorching while letting 85% of nourishing sunlight through. You can use a single cover during the warmer months and add the second once it starts getting colder to protect your plants. Extend The Growing Season Roll-Up Sidewalls & Windows Outdoor Ready Plant Greenhouse Info: Overall Dimension: 70.75' L x 35.5' W x 35.5' H; Window Size of PE Mesh: 27.25' L x 46' W; Window Size of Plastic: 23.5' L x 19.75' W.