I have placed it on an external door that is exposed to hot air and rain. It has stuck very well and no air passes through at all.

28/12/22: If we exclude the fact that when the product arrived, some of the "foam pads" at the bottom were detached, then the product does its job for its price. There may be better quality options available, but they will probably be more expensive. If needed, I will come back.

It is paper, and cheap. Don't expect much. A fabric or another type of insulation is a better solution.

Be careful before purchasing this type of film.

If your door has even the slightest scratch (most of them do), it will never stick. Mine came off on its own within an hour (I found it detached on the floor by itself).