1.[Applicable to]: Window insulation film is suitable for flat sliding windows and external sliding windows. Aluminum alloy windows, plastic steel windows, glass windows, ceramic tile window frames, marble window frames. It can be used in various scenarios such as living room, bedroom, kitchen, bathroom, study room, restaurant, office, etc. 2.[No Drilling]: Winter window insulation film is self-adhesive and does not require drilling tools. Install firmly without damaging window frames and walls. Easy to install and remove. Can be reused. Please measure your window size before purchasing. Please refer to the outer frame size. 3.[Installation]: 1) Clean the adhesive area, 2) Lay the curtain, press the self-adhesive hook surface against the edge of the curtain 3) First remove the top sticker, fix the position of the high-permeability film, and then fix the other three sides.4) Press hard and the installation is completed 4.[Warmth]: Can protect your room from wind and cold in winter; has good thermal insulation effect and wind resistance; translucent window film has light transmittance. It allows plenty of light into your room while maintaining a high level of air tightness. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.