Replacement Polythene covers for all Polytunnel types. As standard we supply XL Horticulture's Sunmaster Diffused with all of our Polytunnel kits, and this is what we have chosen for our standard replacement cover choice. Its the exact same Polythene we use across our own Nursery. Its ones of the best covers on the horticultural market and most plants & crops grow very well under Sunmaster Diffused. Take our word for it, we have over 5 Acres of it! If you require a quote for any other type of Polythene please email us your size and specification and we will be happy to quote.