Bought a few to give away to friends. Although they look thin, they are quite difficult to pierce. Conductive metalized surface is inside. In bright light you can see through you. They are much warmer than duvets made from the same material (I have both). The hand-sized bag fits easily in your car, your tackle box, and even in your jacket pocket. They reflect light very well and are easy to spot from the air, "just squeeze them together" so there are many different angles of reflection. When they arrived I unpacked one and tried it out in 70 degrees Fahrenheit and it overheated after about 2 minutes. Once you open this item you will never put it back in the bag which is why I use a vacuum sealed grocery bag for used products. I highly recommend everyone to have one for each person. Keep a pair in the car, boat, RV, house, etc. 2010 FOLLOW-UP: My lightweight sleeping bag gets cold so I put my "regular sleeping bag" IN one of them, it made a world of difference.
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