I want two pieces of plastic with nylon string in the middle to cover windows in the winter. What is it called

Question

The plastic is strong and with the string it is very strong. I want to cover the screen porch when it snows? What is it called and where can I get it by the roll?

Answer 1

You might be looking for scrim-reinforced film. Is this it?

http://www.geo-synthetics.com/Scrim_Reinforced_Polyethylene.asp