Expand what a "HeetSheet" is for us if you can - I found these online
http://www.marathonblankets.com/solutions.html
These apear to be like those foil survival blankets you can get at sporting goods stores.
I remember as a kid I had a "survival blanket" that was nylon on one side, a thin batting of some kind and quilted foil on the inside. Made a good lite duty ground blanket.
Edit: I found that "Space" blankket - http://www.rei.com/product/407106
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