A little pricey but I absolutely love this material. Comes in 300-400 ft rolls depending on the thickness. I opted for the 5 mil over the 3.5 mil. I believe that this is probably the strongest material on the market. Its considered a hard poly but is very pliable. Just make sure that the temperature is around 70 degrees when you want to work with it. Once installed, you cannot put your fist through it if you tried. The light de-fusion is awesome. There are no shadows anywhere in the greenhouse.