So I have always had these emergency blankets laying around, but never used one, so I took this out to test it out back in early march. It wasn't too cold of a day, mid 60's so when we got to the camp site I set up my hammock and instead of unpacking my sleeping bag I broke this out. That night it got down in the 20s and was windy so I got to start the test. Now this didn't keep me warm and toasty, I never expected it would, but it helped a lot when I was awake. It blocked some of the wind that was coming off the lake and when by the fire helped to heat me up really fast and laying in my hammock it helped to keep some heat in. Now when I woke up 2 hours later it was a different story. I was freezing, but I assume that was from the lack of motion so my body had just cooled down. So I mosey over to stoke the dwindling fire and after 5-10 minutes I was warm again and figured I would go ahead and try to weather the night. Well I didn't get to finish the test because it had started to rain, which wasn't in the forecast. So I stretched it out over my hammock and after running some guidelines made a roof which lasted threw the night. I woke up dry in the morning and I packed it back in its bag, which is handy, and it was still in good condition.
Its better than nothing. It does what its supposed to do, it reflects heat, its durable enough to make a shelter if need be, used as a tarp and plenty of other uses I haven't found. In an emergency I think I would find this very valuable, I keep a couple just in case, and for a couple dollars its not going to break the bank.