I use 48" x 25" REFLECTIX on seven of the nine windows of my travel trailer. Mainly for summer heat. Bubble wrap on steroids. Some aluminum tape to join sections. Press-fit into interior window frames. Rigid enough to store well if not in use. It has other uses for me as well. I think of it as GP -- like duct tape -- as it is easy to use, can be doubled up, cut, re-cut and taped in any of a number of configurations.
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