This 9'x3'x3' tunnel greenhouse features a powder-coated steel frame, 140 GSM PE cover with reinforcement grid, and three roll-up zippered doors. It extends growing seasons, retains heat, blocks UV rays, and offers easy mobility for outdoor gardens.EXTENDED GROWING SEASON: Protects plants from cold and extreme weather, retaining heat to extend growing periods for vegetables, fruits, and flowers year-round.140 GSM REINFORCED PE COVER: Two-layer cover with grid threading prevents tearing, blocks UV scorching, and allows 85% sunlight transmission for healthy growth.ROLL-UP ZIPPERED DOORS: Three roll-up doors with ties enable full access and customizable ventilation, creating optimal airflow for plants.DURABLE STEEL FRAME: Powder-coated steel frame with horizontal tubes and crossbars provides sturdy structural support and easy mobility.AIRTIGHT SEAL & STABILITY: Overlong cover design creates a secure seal when buried; durable plastic connectors enhance overall stability. Product Type: Portable Tunnel GreenhouseAssembled Dimensions: 108.00" L x 36.00" W x 36.00" H (9'L x 3'W x 3'H)Main Material: Steel (frame), 140 GSM PE (cover)Product Weight: 8.80 lbsKey Features: Roll-up doors, UV protection, heat retention, reinforced cover, easy mobilityWindproof Level: 4Steel Tube Size: 16 mmNote: Assembly required