Also known as an emergency blanket, first-aid blanket, Mylar blanket, thermal blanket or weather blanket, the space blanket is a necessity if you should have to stay the night in the words.
Developed for the space program (hence its name), the ultrathin sheet is lightweight and takes up little space. Its materials reflect 97% of all heat, making it an ideal shelter wall, let alone blanket.
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Read more about day hiking with children in my guidebook Hikes with Tykes.