Friday, April 6, 2012

Survival Gear- Bug out Bag Essentials- Mylar Blankets

Emergency Mylar Thermal Blankets (Pack of 10)

Emergency Mylar Thermal Blankets (Pack of 10)

This product is probably what you think it is. One of those loud, crinkly, reflective "space" type blankets. They're fairly cheap, and you get a lot of them. They're very useful for keeping a person warm if you know how to use them.

Some people complain that it doesn't keep them warm at all. This is most likely because they aren't using it properly. There are better articles for this information than this review, but essentially.. This blanket prevents heat-loss from radiation (which is how the majority of our body heat is lost). Radiation is when heat radiates away from its source. This is where the product shines: it allows hot pockets of air to form between you and the blanket. It doesn't do much to protect against conduction since it's so thin. Conduction occurs when heat transfers from one place to another by touching. When you grab an ice-cube, you are losing heat because of conduction. Similarly, if you are in a very windy area, while the blanket itself is wind-proof, the cold air can get under and inside the blanket, stealing away your warmth.

As such, when using this blanket, you should squat down and wrap it around you. By laying on the bare ground, there is no "dead air space" for the hot air to collect so, by the process of conduction, your body looses heat through the ground. This product works really well as a sort of "base layer" type of blanket. If you have a sleeping pad and sleeping bag, line the insides of your sleeping bag with one of these and you'll be toasty in no time. Just be sure not to start sweating too much, because of hypothermia and stuff. Even without those fancy sleeping bags, one of these covered by a wool blanket will keep you very warm. Just remember not to wrap the blanket to tightly around you. It is instinctive when you want to get warm, but it'll decrease the effectiveness and may rip it since it's so frail.

No comments:

Post a Comment