The3M 2141W Indoor 5-Window Insulator Kitis a money saving product. I installed these in my screen patio on the inside window frames. Because there are not any windows, just screens I am trying these out to see if they will help keep the wind out. Not necessarily the cold.The product is packaged with two rolls of tape. The tape holds securely to my painted window frames. The plastic film is in one big piece and folded. The film fits the window frames perfectly. The tape holds the film securely, but lets you reposition to take out the big wrinkles. After trimming the excess film, I took out the rest of any small wrinkles with a hair dryer. The film is crystal clear, almost invisible.It has dramatically stopped the wind in my patio, making it more enjoyable in the winter.Now if I can just keep my cat away from poking holes in it...