This Christow Exta-Large Reinforced Walk-In Greenhouse Cover is a perfect replacement for a damaged cover and is a fantastic upgrade if your existing cover is made from PVC. Suitable for covering the majority of larger walk-in greenhouse frames, it consists of an internal grid sandwiched between two layers of polyethylene. This triple layer design makes it far tougher than standard PVC. It also helps to stabilise the frame and provide greater insulation to plants and flowers. A roll-up double zipped door provides easy access when tending to your plants. Christow Reinforced Extra-Large Walk-In Greenhouse Cover Slip over polyethylene cover for larger walk-in greenhouses Superior durability and insulation than standard PVC Ties to tightly secure to the frame of your greenhouse Roll-up double zipped door for easy access 2 ties to secure door when tending to plants and flowers Allows plants to absorb sunlight throughout the day Helps to insulate them when the temperature drops at night For