These are the Emergency "Space Blankets" that you hear so much about.
What are they really?
They are just a simple sheet of heavy weight mylar film very neatly folded to fit in your pocket.
Why are they called "Space Blankets"?
Mylar was developed for the manned space program
Do they work?
Absolutely, they help you retain 90% of your body heat. Every car, boat, plane, backpacker, disaster kit and first aid kit should have at least one. Locally, every school has a cache of them for disaster.
Are they reusable?
Sure, can you neatly fold it back up again? But they are so inexpensive why bother.
What other uses do they have?
Sleeping Bag Specs Below:
These emergency sleeping bags are just the ticket for your emergency needs.
Retains 90% of body heat
Can be used by itself or in conjunction with a sleeping bag (inside or over).
Complete thermal protection from rain and snow
Size: 84" X 36" , Weighs Less Than 3 oz.