Space Emergency Bag
Here's what other sites are saying:
EMERGENCY BAG: The next logical giant step beyond the metallicized Emergency Blanket. It can be used alone, inside or outside of sleeping bags in survival situations. The full size 36" x 84" bag of original Emergency Blanket material with taped seams and collar retains in excess of 90% of radiated body heat while weighing only (4 oz). Every outdoors person should carry one, every snow country car should be equipped with them, every wilderness cabin and ski lodge should be well stocked with them. As they say - Don't leave home without one!
This sleeping-bag-shaped safety blanket is designed to be a safety barrier during emergencies.