A thermal blanket could literally save your life. These NASA-designed blankets use military-grade aluminized mylar to retain up to 90 percent of your body heat and completely block out any and all of the elements.

This 4-pack of mylar blankets from Swiss Safe is the #1 bestseller in the category of Camping Emergency Blankets. And take a look at the customer rating!

Ninety percent of those 500+ customers gave these space blankets a perfect 5 out of 5. And get this – this 4-pack is currently 75 percent off.

Swiss Safe Emergency Mylar Thermal Blankets (4-Pack) + Bonus Signature Gold Foil Space Blanket: Designed NASA – Perfect Outdoors, Hiking, Survival, Marathons First Aid on sale for $6.29

And although it is billed as a 4-pack, you actually get 5 blankets here (hence why this article title says 5-pack). Why? Because the deal comes with a bonus gold blanket.