way back, when accomplishing a six day spring ski expedition through the Sierra Nevada in Central California the team I used to be with was encouraged to employ VBL. Being lousy I applied compact plastic baggage for my socks and bigger plastic luggage for my sleeping luggage. it had been warm throughout the day, so I only used the VBL during the night, apart from the read more socks. I wore a thin layer of polypro (this was twenty five a long time back) and put the plastic bag with holes for my head and arms on.
I’ve also read of folks employing a synthetic overquilt in addition to their bag to attempt to move the dew position from the down and into this outer layer – it looks like probably this method is also placed on clothing?
I’m not worried about the lack of “waterproofness” — my shelter serves this purpose incredibly very well, and WP/B fabrics aren’t that water-resistant in any case.
g. liner gloves, headbands, base layer shirt), so that I don’t set myself at risk Once i wet out a layer. Indeed, You must have a bit much more excess weight, but that’s better than hypothermia or dexterity-less fingers. VBL levels usually are not for functions where by major sweating can not be prevented.
SoI utilised a elaborate patigucci polypro with which I acquired as well warm (examine sweat). On a whim I attempted a mesh shirt made by Wiggy’s and had excellent results. The mesh aids build a layer of dead air Place amongst myself as well as the VBL with no conductive heat loss. It worked so very well I paid almost 3 times just as much for your Brynje shirt from Norway. much more outstanding. I believe the mesh may be the missing factor in VBL programs.
not too long ago, I purchased a sleeping bag VBL produced by Western Mountaineering and adore it! I've analyzed it out within a 32 degree WM Summerlite bag in -9 degree weather conditions… Here is the hyperlink to my films should you care to Have a look.
Bill Kline on July 3, 2018 at eleven:twenty five am As far as I understand- and in my working experience- the colder the better In terms of VBs. The big trick to VBs is using them when It's not necessarily so cold and/or Once your exercise is significant. I’d say that you are accurate any time you say “due to the fact as considerably my knowledge, VBL not allowing the humidity to pass through”, although not correct with this portion: ” it is going to make dilemma at temperatures beneath -30 or -forty diploma celsius.”. I’d say which the colder it truly is outdoors, the more likely itis the down inside your sleeping bag or other insulation will probably be below the dew level, as well as the greater likely One's body vapor will be to condense to liquid INSIDE your insulation and in many cases freeze sound, wiping out your loft.
You have to have examine some incorrect details about synthetic versus down insulation with respect to dew factors. The mechanics are the identical for both equally types of insulations:
many thanks a great deal for this genuinely specific and instructive write-up. I’m heading to Lapland then Svalbard in 10 times, and seeking to organize with the conditions.
And it’ll absolutely be over freezing throughout the day, in which you can “reset” dry” your sleeping bag every number of times if you do observe that it's accumulating some moisture.
But here is the detail: I know that i'm gonna sweat with any degree of insulation, at not way cold temps, if I thrust it that tough. I just may not be quite mindful of it until finally I cease, considering that my wicking base levels and insulation(fleece or regardless of what) might be removing it from my skin into your insulation. But that working day(as well as other related times) my cotton shirt was thoroughly bone dry. Have you ever at any time gotten a chill just after mountaineering true hard then using a break, even sporting artificial insulation? I've! Even though I felt damp with sweat under the VB just after I halt working out, I did or never obtain a chill. I'm however heat. And the moment I take out the VB, I obtain it and my skin dries really quick, making sure that I'm able to promptly toss over a dry parka(if wanted) without getting it wet.
it truly is intriguing to read the critics on the vapor barrier tactic who haven't in fact expert the extraordinary efficiency at sub zero temperatures. In all it provides the advantage of preserving the insulating ability of down by retaining it dry, and reducing the amount of insulation essential overall by avoiding the cooling result of insensible perspiration. Using a mild layer of artificial long underwear, then a light rain suit, followed by large fleece my summer months body weight down negative offered in excess of ample insulation to help keep toasty warm at zero levels. An impressive efficiency. For those people with cold extremities, feet and palms, even one thing as simple as a bread bag about a liner sock then a heavier insulating sock can make your feet feel like they are increasingly being warmed by a wood stove.
For the AT in winter I don’t Assume you may need the Altitude liner, although it weighs only a very small little bit more than the Hybrid version, so I’d probably just Select it — because it is artificial insulation, its warmth will minimize with put on.
On One more topic, the night I ate a dice of butter was the warmest and most cozy evening I have snow camped!