Nano Hydrophobic material technology- PET-Nano coating protective film with high transmittance,anti-fog,anti-glare,anti-mist,waterproof,rainproof. Clearer and safer Protect your Rear view Side Mirrors from unwanted smears,such as dust and dirt, so as to keep your rear view mirror clear all the times. (2 sticks on mirror and 2 sticks on door window.)Anti Fog Film could clarify the view area for averting possible danger due to fogged mirrors .Compatibility- Universal designed Rear View Mirror Protective Film for Car, SUV, Truck, Trailer,motor,helmet etc., which fits all standard size of side mirrors. Easy Installation- Use the cleaning tool clean the preordered paste area. squirt a little water on the mirror,then install the anti fogging film on the rear view mirror, and adjust the size and angle before the spray is completely dry.Finally, flatten it with a spatula.(To prevent the bubble)Tearing off the anti-fog film on the mirror without any worries. Effect: It can protect your driving sight on rainy days.