(Continued from Part 4.)
Sleeping
Once you’ve got your shelter set up you’ll probably want to get some sleep. You need to start with ensuring you’re as insulated from the cold ground as possible. Earlier I mentioned that if there’s snow on the ground that can actually help insulate you, since snow is mostly air. Another trick is to place leaves or pine boughs down before you lay down your tent’s ground cloth/footprint to add another layer of insulation. Next you’re going to want some kind of sleeping pad to increase your comfort and add even more insulation. Companies like Klymit make sleeping pads that have insulation built right into the pad, but you can get almost as much insulation for less money (and slightly more comfort) by using a thicker 4” inflatable pad. Don’t make the mistake of thinking that a nice thick sleeping bag will allow you to skimp on the ground insulation – cold weather sleeping bags rely on loft for insulation, and when you lay down you compress all of that loft under you, significantly reducing its effectiveness.
On top of all of that insulation you’ll typically use a sleeping bag; regardless of how cold you think it’ll get I recommend you get a sleeping bag rated for at least 0°F for winter camping, if not lower. Note that cold-weather sleeping bags don’t need to be expensive – Coleman has a nice one that I’ve used for the last few years that costs less than $50. It’s a bulkier and heavier than the more expensive ones, but it works well for me. In regards to temperature ratings, there are internationally recognized standards for how the temperature comfort of sleeping bags are rated (EN and ISO), but not all vendors utilize them and I find them somewhat complicated to follow. The rule of thumb I’ve always used is that if you sleep hot, use the manufacturers rating minus 10-20°F; if you sleep cold use the rating minus 20-30°F. There are several things you can do to increase your warmth while sleeping – you can keep your long underwear and socks on, put on a fleece or puffer layer (a friend of mine actually brings fleece PJs when she camps in the winter), or wrap your sleeping bag in a mylar space blanket to help keep the heat in. You can also use heat packs, electronic hand warmers or heated rocks inside the bag to warm things up even more (don’t use anything that relies on combustion inside a sleeping bag!).
I know there are folks that prefer to use a blanket or quilt when sleeping, which I find works well down to about 50°F, but when the temperature start to drop down towards freezing I find that nothing beats a toasty mummy bag.
Somewhat related to sleeping is sitting – if you’re moving around outside you’re eventually going to get tired and want to sit down to take a rest. As I mentioned before, conduction if the most efficient form of heat transfer, and if you’re sitting on a cold rock or log your body heat will be quickly leaving through the part of you that’s in contact. Some folks bring a small foam cushion to sit on, but I prefer something that packs smaller so I bring a Klymit V Seat Cushion. It rolls up into a really small package that I keep in an outer pocket and only requires a couple of quick breaths to inflate, and the air does a nice job of insulating me from whatever I sit on.Continue reading“Cold Weather Considerations – Part 4, by JM”