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Those mylar blankets are as effective as a trash bag in keeping warm.... 15 minutes spent in those will convice you quickly. The Adventure brand is the best of this type, but desn't even come close to the warmth of a cheap fleece blanket.
The two most common car troubles are dead batteries and flat tires, which is why thos portable battery jumpers/ inflators do so well. I gave one to a friend and she has used it 3 times helping stranded travelors.
Then why would you say, is similar material used to insulate against the temp extremes found in space? They reflect heat pretty efficiently.
In a perfect vacuum, heat is only transferred by radiation, not convection or conduction. So a thin reflective shield is all that is needed.
Down here, conduction (need for a sleeping mat on the cold ground) and convection (north wind blowing) are very important when trying to stay warm.
"Space Blanket" mylar blanket:
Blocks wind
Blocks rain
Reflect heat from candle or other source (so, lean to or fire reflector)
Reflects radar
Reflects light at night and easily spotted from the air during the day
Light enough to move in little wind for easy visibility in signaling
As a ground tarp can reflect heat back to an injured person and keep moisture off them
Reflects infra-red heat back at someone loosely wrapped
Can collect rain water
Can be used as a tarp to butcher game and keep the parts cleaner
And can fit in a bag or back pocket and be forgotten about because it weighs almost nothing. It can be carried in addition to whatever else you carry, and if you want, you can have one with you ALL the time.
My parents got a huge roll of the stuff (about two miles long, four feet wide) back in the 70's. We wrapped Christmas presents in it and did all sorts of stuff with it fooling around as kids. In a house, wrapped up in it, you will very quickly start sweating.
Is it a cold weather sleeping system? No. Might it save your ass from dying of shock in a stranded car after a mid winter night slide off accident? Yes, it just might.
For a few cents each and an ounce or two for all this? I think I'll ignore the naysayers.
Don't let the perfect be the enemy of the good.