1. WEATHERPROOFING WINDOW INSULATION KITS - The thermal insulation film isolates cold air from entering the indoor space, locks the indoor temperature, effectively reduces indoor temperature loss, keeps the indoor temperature stable for a long time, effectively reduces the loss of heating, greatly reduces electricity consumption, and is environmentally friendly and energy-saving. 2. THICKENED EVA MATERIAL - This thickened thermal insulation window film is made of thickened EVA material, which is more durable. Tear-resistant, wind-resistant, stretchable, non-deformable, waterproof and keeps the room warm in winter and cool in summer. Can be reusable. 3. SIZE SELECTION - Window Insulation Kit provides a variety of sizes to choose from. Before you buy, please carefully measure the size of your window. If you measure the size of the window (inner diameter), you need to choose the size of the window insulation kit that is 6 - 10 cm larger than the window size. If you measure the size of the window frame (outer diameter), choose the size according to the actual measurement. 4. EASY TO INSTALL & REMOVE - This winter window insulation kit is easy to install with adhesive loop straps. No drilling tool or other auxiliary tools like a hair dryer are needed for installation. You can follow our product diagram to install. (The package includes 1 piece of winter plastic window film and hook and loop tape.)