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