The Window Insulation Kit from EcoSavers is developed for single layer glass windows. With this kit you can create an extra layer between the glass and the room. The air between the glass and the plastic window insulation film act as an insulator, similar to the double glazed window systems. The film in this kit is 50% thicker then similar systems on the market which guarantees a much stronger and durable installation of the film. Kit contents: 2 sheets of 157 x 120 cm. 17.5 meter strong double sided adhesive tape.