Quick answer is YES.
It absorbed the damage from a rogue 2x4 and a road gator. Chewed up the foam a bit.
Logic would say that it also holds in the heat in the winter and the cool in the summer. Without stepping from a trailer without to one with the foam I can't say for sure. I can tell you the floor is still cold when it's in the 20's or 30's, rugs take care of that.
I'll believe John that it keeps out the heat.
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Happy Motoring
Bob
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