This is an inexpensive and safer way of driving when we have bad weather. At first, I didn't think it would really make a difference or even work. To my surprise, it comes in handy. It has been raining a lot here and I hate driving in the rain. These are so easy to apply. You just have to make sure your mirrors are super clean and press down and spray a bit more. Make sure to get the air out. The thing about it is that it helps your mirrors look clear and not fog up. You have a better view. How great are these?