Well, I was right. Since this is reinforced, there is ZERO stretching going on there.
I did cut the one corner slightly, and then, tried to pull the upper and lower pieces apart with 2 pair of pliers. I did manage to separate them slightly, but not much.
Here you can see, there is fiberglass inside, between the two layers.
You can also see, that both corners are stretched somewhat where the 2 pair of pliers were used to help pull them apart.
With all that fiberglass in there, ah, yea, the 2 layers together, won't be stretching at all.
