Made my own for the two skylights in ours to cut down on heat.
Used reflectix, heat resistant material, and a layer of actual material on the inside to go with the interior better. The side toward the skylights I sewed a strip of Velcro all the way around to use for the mounting.
Used command strips Velcro to hold inside the skylights.
They work great and we can still use the blinds that are in the skylights if we want.
No screws to mess with and they have been there for two seasons now with no issues with the command strips Velcro either.
Work great to block the heat.
Plus now I have a sewing machine and learned how to use one so I can make more stuff [emoji3]