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I bought these because the description said "single-sided" meaning only one side of the blanket is reflective. This makes the blanket helpful for holding in body heat (use with the shiny side in) or deflecting the sun so you don't get so hot (use with the shiny side out). If you used these double-sided blankets when you wanted to deflect sun and reduce your body temp increasing, you'd also be holding in body heat. Oops! I rated them low because the description is inaccurate in a way that could have serious bad effects. Putting that aside, they are the typical super duper thin crinkly blankets that are good for only one use during which you wrap it around yourself.
I have bought this kind of blanket many times before. When new, they are supposed to be folded very well and very compact. The individual packs of this one are folded badly and loosely (with a zip bag of too large size), with a lot of air inside. For the same price, why settle down on something like this?
When I was a Boy Scout decades ago, all of us carried a "space blanket" in our gear, even daypacks, in case of emergency. There were single-layer sheets (what we could afford) and multilayer quilt-stitched military casualty blankets, which were far more robust. For any potential survival situation, stick to the multilayer products unless you have bought a lighter product to test to destruction before betting your life on it!
I can still find the single-layer sheets that are worth having and durable enough to use multiple times. I have them stuffed into the bottoms of my family's and my sleeping bag stuff sacks. These aren't those, Out of 6 sheets I unpacked for a radiant barrier in my tent on a recent trip, I tore *every single one* while trying to gently, gingerly, lovingly unfold them. Holes tore in the middle of the sheets if I looked at them too sternly, but most of the tears started at an edge, with unbelievably little force applied. It is as though they were designed such that the end product would be bits of chaff.
These might be usable for an emergency situation that was not exactly life threatening. I personally would not want to depend on these if backpacking in the backwoods and needed to stay warm. My experience was that the foil was so thin, that it ripped while opening/unfolding and was near uncontrollable in a very light breeze. I couldn't imagine any stronger wind than 5 mph! It would rip the thing apart. And yes, I concur with other reviews, these are just way to small to cover your WHOLE body. Perhaps if you have patience to tape them together, like one customer mentioned... but... I would rather just open it up and use it. All in all, I will keep this bunch, but NOT for backpacking. I'm crafty, so maybe I will figure something out. Like... (sigh) taping them together. I wouldn't suggest coating a space shuttle with this stuff, though. :)