Originally Posted by sclittlefield
Yes. It appears to be the same thing. And it is very similar, thought not quite the same thing. I don't think it will work equally as well, but I do know it will work well - I've done it (not with underlayment, but with the microfoam used in shipping large screen tv's), and it worked. It's bulkier and heavier, but could be more obtainable.
I just installed a bunch of monitors at one of my job locations. I collected all this fine microfoam sheets and made a pillow out of it. Weighs very little, and is *very* warm.