Seems effective (so far . . .)
This was the most substantial windshield shade I could find for 2014 LTV Sprinter RV--7-ply. I've had it a week or so now, and It has definitely reduced the heat build-up. The fit is good, although the cut-out is larger than necessary for our model Sprinter (windshield mounted rv mirror. And it it is bulky, but not that hard to deploy. The real test will come when we make we make another trip to Arizona.