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It's probably worth pointing out that a lot of people reading this question may be thinking along the (commonly quoted) line that about 80% of body heat is lost through the head - which is much more of a myth than people realise (See here for details.) From what I remember, it was an experiment done with people fully kitted out apart from the fact that they ...

Heat loss can occur from anywhere on the body through a number of processes: Conduction e.g. when sitting on the ground. Convection e.g. due to wind chill. Radiation i.e. heat loss direct to the environment from exposed skin. Evaporation i.e. heat loss through perspiration. Other factors: Metabolism generates heat; conversely, without enough sustenance ...

Some, not all, do indeed come in two sides, and which one you use depends on the reason you use it. One of the sides strongly reflects heat. A hypothermic person therefore wants to have that reflective side on the inside so that it helps keeping any warmth inside. A person suffering from heat stroke wants the reflective side outside so that heat is kept away ...

My original answer to this question sparked a surprisingly intense debate, so I'm rewriting it to clarify a few points and offer a more holistic answer. Let me start by saying that every square inch of skin on the human body is capable of allowing heat to escape. That is to say, if you wear a jacket with no pants, your legs will lose more heat than your ...

Your body heat is reflected back at you from the shiny silver side. One of the reasons some blankets have two colors is so people would realize there was a correct side to get the most benefit. The other is that the "wrong side" color choice can be an aid in some signaling situations. Even when they are silver on both sides, there is often one side ...

Personally, I would use a wind chill chart, e.g this keyring compass includes a wind chill chart that would be easy to carry. It's still not going to be accurate, but it would provide a guide when you have nothing better. Take a look at the Wikipedia page on wind chill, the calculations look a bit "frightening" - not something I would like to do in my head. ...

a two layer winter hat to protect your ears a good winter jacket (long enough) supporting -40ºC (-40ºF) winter boots a two layer gloves a scarf For the intermediate layer: The key point is to not sweat. Depending on your body, you should choose the appropriate "heat level" intermediate layer. Some shops will have different categories from very cool to ...

There are two problems with this question: Night-time temperatures vary a great deal across Spain-it is a big country, with coasts, plains and mountains Your ideal temperature may be very different to mine So what you want to do is look at the range of expected temperatures in the area you plan to camp, compare those with temperatures you are comfortable ...

Relative humidity is doing to be a big factor here, both on the too wet and too dry sides. Staying warm is generally not something you want to try to do "by the numbers". If you're out in the cold and wind, you need to pay attention to the feedback your body is giving you about the conditions you are in. Pay attention for the signs of hypothermia, ...

This question has been answered already, but this problem interested me and I thought I'd share for future readers what I found by playing around with it. The North American Wind Chill Index as presented by NOAA here is based on the formula (itself an approximation), The chart applies to temperatures T from 40F to -45F and wind speeds 5mph to 60mph, and ...

Lots of ways to reduce heat loss: Wear a hat scarf and gloves as these keep the most important parts of your body warm. Wear warm knickers (even if you're a guy). You can get fleecy knickers but not fleecy pants. Also, you can huddle, like penguins as it reduces your surface area and conserves bodyheat.