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 Compare prices from: Christow in Outdoor Equipment