1.Advantages: This is an innovation that can solve the problem that you can't clearly see the double glasses in the rainy days, so that your vision is clearer and the travel is safer.2.Effect: It can protect your driving sight on rainy days.3.It is a universal size exterior mirror. You can freely cut into pieces as needed.4.Waterproof, anti-fog and dustproof effect is good.5.Nano hydrophilic technology.