I like extra light emergency blankets that keep the body warm in cold weather or when injured, or on a sunny day reduce body heat absorption by reflecting the sun but not retaining body heat. . For that I need blankets that only reflect on one side, and they're surprisingly hard to find. I carefully and partially unrolled one of these to check what's on each side and they don't appear to be any thicker or heavier than a classic foil blanket. The orange side doesn't make them noticeably heavier. They're not meant to be reused, which is fine with me as I don't need them very often and the extra weight of the package isn't worth it.
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