This car windshield sunshade is definitely the most practical car product I have bought this year! I used it for the first time when the temperature was 38 degrees last week, and the effect was amazing - the PVC material completely blocked the dazzling sunlight, the steering wheel was no longer hot when getting in the car, and the seat would not burn my butt. The 18.5-inch size just covers the front windshield of my SUV, and the installation is very fool-proof, just stick it on the glass and it's done. What surprised me most was the one-touch retraction function. Just press the side button lightly, and it will automatically roll back in a "swish", and you don't have to fold it up like a traditional sun visor. When it's not in use, the small roll is stuffed in the door storage compartment and doesn't take up any space. I also found that it is very versatile. It can be used not only in the car, but also on the west-facing bay window at home. When the sun is the most poisonous in the afternoon, pull it down and the room temperature can be reduced by several degrees. Since I have it, I no longer have to worry about the items in the car being aged by the sun, and I don't have to wear sunglasses to prevent glare when driving. I sincerely recommend it to all car owners who are afraid of the sun!