I made a reflectix cover for my sunroof
I live in southern California and I was sick of my head roasting on a hot sunny day in my xc40 so I made a insulation layer between the sunroof and the shade out of some Home Depot reflectix and some gaffer tape. I measured the glass and added and inch either direction to have a half inch overlap inside. I radius'd the corners by eye. It turned out that little bit of extra width also helps it stay up. To install I opened the shade and then pressed up the reflector, then closed the shade with the reflectix above. It has made a huge difference. The car is cooler inside in general, and I don't feel the heat on my head any more on a hot sunny day. It is easy to put in and take out. I just roll it up and chuck it in the back if I want to open the sunroof.
It was easy. I used tape, a tape measure and a pair of scissors. It has made a big difference in my driving enjoyment. It's a little thing, but over time it's a big thing.
Hope this helps someone.