Polytunnel Greenhouse, Temperature control, UV Protection, Wind-proof, rain-proof, Humidity control 140G TRANSPARENT PE MATERIAL with green checkers, UV protected, 2 x Double zipped door with metal zip heads (Enter from both end) Our garden polytunnel is made of 19 MM powder-coated steel pipes for durability and long-time use Diagonal storm bracing bars. Longitudinal roof barsfull ground bar and support bar on both side (some items design) At bottom, there is about 25cm redundant cover, for that soil or stone can press on it to prevent storm and ensure obturation.