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7

Plenty of places sell sleeping bag liners. Sometimes they are designed to make the bag warmer, other times to be more absorbent. For example, Mountain Equipment co-op sells quite a few, some of which are cotton and mention "absorbency" and "comfort" in their descriptions. I don't doubt that other suppliers offer them too.


7

I get far too hot but like you I find that layer part of the night gets cold. My solution in temperate climates is to only ever zip the sleeping bag up halfway so the top half is left loose, that way I can pull it over me or off again without waking up. If it is a wee bit cooler you could try this technique as well as a thin sheet or blanket.


7

Wind chill factors verge on being junk science, especially when interpreted uncritically. However, your physical intuition does make sense, and published formulas and tables do have a property very much like the one you have in mind: as the wind speed increases, the incremental effect of adding a given amount to the wind speed gets smaller and smaller. For ...


6

The phenomenon name is cold diuresis. From thefreedictionary.com: [cold diuresis] occurs in hypothermia as a result of peripheral vasoconstriction, hyperglycemia and decreased renal tubular absorption. You can easily find articles and papers on the subject on the Internet.


6

There's not yet a good answer that asks for the reason the fingers, toes (and nose and ears) are cold, so let me add a few points: (I'm assuming around 0°C according to the question - of course, -40 °C is different). Here are a couple of reasons why your fingers and toes get cold in the first place: Of course, you may not yet be used to the cold ...


5

The key to cold weather clothing is viewing it as a system. The base layer of the system wicks moisture from the body and provides a small amount of insulation. The middle layer(s) of the system provide warmth and wind protection. The outer layer provides protection from the elements. That being said, a proven system for the temperature range you're ...


5

It's also a good idea when camping in freezing weather to pour some water into your cooking pot before going to sleep so that if it freezes overnight it will freeze in the pot rather than the container. It's a lot easier then to melt the ice in the pot rather than the container when you wake up in the morning and want the water for breakfast or a hot drink!


4

Cotton is the dominant bedding material choice worldwide for several reasons and as long as you aren't getting into the bag drenched and have adequate water control for your environment, I can't see the lining choice being a make or break factor in warmth. I can see it making the bag much more comfortable for casual use. Furthermore, for winter camping in ...


4

Some of us, when adventuring, go to far off remote places, in very cold or wet areas, and carry everything with us on our backs. But not everyone does that. Some people only car camp, in the summer, where bathrooms and showers are 200 feet away. For those sorts of camping situations, people's needs in a sleeping bag are essentially nothing more than ...


4

No there is no limit to the math of wind chill, though there is a maximum wind speed that has ever been observed. Here is what wind chill is. Imagine you have a hot cup of coffee. You can leave it at room temperature for a while and it will cool down to where you can drink it. Or, you can put it in the fridge and it will cool faster. Or put it in the ...


3

Your understanding of wind-chill is a bit confused. The reason the wind feels colder is because of convective heat transfer. When there is a difference in temperature between two objects, thermal energy transfers from the hot to the cold. In the case of a person in the air, the thermal energy flows into the air, and the faster the air is moving, the more ...


3

You actually don't need to go outdoors to get struck by Hypothermia. But you can suffer from it on a trek where you don't have a proper campsite, camping equipment, or good clothing and bedding. From http://www.globalaging.org/health/us/hypothermia.htm The most important step in treating hypothermia is to make and then keep a person warm and dry. ...


3

Swinging your arms and legs to move blood to your extremities is good advice and will overcome your body's vasoconstriction response, but keep in mind you should also layer up after doing this since you are driving heat energy away from your core. If you are in camp, drinking a hot beverage (and also holding it while you drink) will warm your core and ease ...


3

Leaves under your tent will offer almost no value as you will crush them when you lay in your tent. The primary benefit from leaves comes from dead air space. However they will provide a more smooth and soft sleeping surface. Leaves piled around your tent will provide good insulation as long as they do not get wet. I could not find an R value, but I did ...


3

In my experience, it generally works fine if I simply use cheap, lightweight water bottles (e.g., a 2-liter soda bottle), and put them inside my pack while I'm hiking. The surrounding material in the pack insulates the bottle from the cold air, and my body heats up the pack, so the water doesn't freeze. If the weather is very cold, I can use extra care in ...


2

Go to your nearest military surplus store and ask if they have any arctic water bottles. These water bottles are made out of aluminum, they are generally round. They are fairly good to hold a lot of water for their size, the water should last about a day or two before we need to be filled (Depending on how much water you drink). They will never freeze. ...


2

When I have to sleep in moist cold air I always put some newspapers under my matras. It absorbs the water thus keeping me much better dry and warm. If those leaves are dry when find them you can also put them under your matras with the same effect. I think it will work even better than putting them under the tent.


2

British mountaineer Andy Kirkpatrick has quite a bit of useful information regarding how to look after your feet at altitude and in cold conditions on his website at http://www.andy-kirkpatrick.com/articles/view/how_to_avoid_frostbitten_feet. The only recommendation on footwear size he gives with respect to high altitude, is for Neoprene socks. He ...


2

I can't recommend Hempsocks, except you use them as second socks to reduce friction. They're very durable but not comfortable to wear. A good alternative to Merinowool is Bamboo, it's also very smooth and dries very quick. So in short, hemp is good to protect your socks or reduce friction because it's a very cheap and durable material, doesn't cost much - ...


1

and are there other textiles that can work? One option is of course polypropylene, it is hydrophobic (unlike most other materials used in clothing) and has a lower thermal conductivity than wool - this does not mean better insulation, but it is a safe bet it can perform fairly well over natural fibres and is fairly cheap. You may see these as liners to ...


1

Among people I've talked to who have tried bivy sacks, none have had anything good to say about them. Tarping is a great way to save weight compared to bringing a tent, but putting up a tarp is time-consuming, requires practice, and is somewhat dependent on your surroundings (e.g., whether there are trees available). Tarps often flap in the wind, which can ...


1

You might want to look at Reflectix, an thin, well-insulating material used for car windshield shades, among other things. You can get it at any hardware store. My only concern would be that it's not breathable, but I suppose neither is your cap. For the floor, conventional camping sleeping pads are probably the best bet.


1

You can sit on your hands or cross your arms over your chest, clench a fist, and pump your muscles. Secondly heat up for core muscles (abdomen, chest, thighs). Increasing your core temp will promote better heat circulation. Inturn, gulp down near hot cup of water, eat soup, take a hot bath. Doing so will keep you warm for a good while.


1

I've used Jordan david ice grips called Altragrips-Lite™ LP’s. I can go in and out of the store where I work. The spikes are 1mm studs that don't dig into the floor either. I've used over the years, and if they get wet, these ice grips have fallen off. However if you put some straps on them, the ice grips will not fall off. For more info ...


1

Why exactly do you need to carry frozen water? If the temperature is about 0 C, the water will not freeze for a long time anyway. If it is way below 0 C, than you are probably having snow nearby, which you can perfectly use for cooking. You can melt snow during your breakfast, lunch and dinner. If you want to avoid spending time on boiling at lunch, take ...


1

From my experience - no way. If the temperature outside is below the comfort range of your sleeping bag, you'll have to put some extra things on you, otherwise you risk hypothermia (in best case - sleepless night). The best things are the fleece ones. However, when it goes to trousers and jackets (normal or rain-proof, without warming), it's usually a ...


1

Also, I'd like to add stay out of the wind. The wind will suck away any heat you build up, and unless you have a strong tent, cold air will pour in through the seams. One time we were dumb enough to camp on a mountain bald with no trees to protect us in a steady 40 mph wind and a member of our group was in early stages of hypothermia before we were able to ...



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