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Check these threads for my adventures with Garlington Insulators made from space blankets:

http://www.hammockforums.net/forum/showthread.php?t=36668
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If you make flatter ones using a space blanket as an envelope, you end up with a wide insulator that will wrap around you and is held up by the undercover. I don't know how snug the SS cover is, but...

If you want mounting points, you can sew mitten hooks or mitten hook rings to the hammock and/or under cover with a small button on the back side for reinforcement. Using those for attachment...