Mylar survival space blanket is designed by NASA for space exploration and it retains up to 90% of the body heat. Retain Up to 90% of body heat Helps prevent hypothermia and shock Light Weight and Compact Multi-Purpose Designed by NASA Size: 52" X 82"Folded Size: 4" X 3" X 0.5"Weight: 2 oz. Mylar Space blanket is a must have for your travel adventure. Each blanket is folded, wrapped, and sealed in the bag size of a credit card and weighs about 2 ounces. It also can be used as an emergency shelter, shade cover, poncho etc.