Material: Parrotias thermal blanket is made of durable insulating mylar material designed by NASA for space exploration and it retains up to 90% of your body heat. 
Lightweight:  Each 52''x 82'' emergency blanket is folded, wrapped, and sealed in the bag size of a credit card and weighs about 2 ounces. With its size and weight advantages, you can put it in your backpack and pocket easily without stress.