I made the mistake of not measuring my windshield and ordered the medium when a large would have been perfect, but they are stiff and still work tucked under the visors.
Oh and did I mention I live in Central Florida where the sun seems to beam the hardest... Well, this sunshade has helped tremendously; I am able to get right in my car and touch the wheel without any discomfort.
It is simple to stick this in the winsdshield area and pull my visors down to hold it in place.
The size was right just not the fit.
Very good product and size is just fit .
The sunshade works except for its being too oversized for a Prius.
I ordered this one after reading some previous reviews complaining that the smaller size turned out to be too small.. Too large is better than too small, I guess.
Didn't fit my Prius.
A bit cumbersome to deal with.