This Christow 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. Designed to fit the majority of large walk-in greenhouses, it consists of an internal grid sandwiched between two layers of polyethylene. This triple layer construction makes if far more durable than standard PVC. It also helps to stabilise the frame and offer greater insulation to plants and flowers. A roll-up double zipped door provides easy access when tending to your plants. Christow Reinforced Large Walk-In Greenhouse Cover Slip over polyethylene cover for large 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 frames