equally as VB necessitates cautious thermal administration, it’s also very possible to deal with the quantity of moisture buildup in a very non-VB sleeping procedure by avoiding overheating. In that regard, your position about wearing further insulation levels below your sleeping bag is perfectly taken: that more layer results in yet another temperature gradient amongst you and also the insulation inside the bag, building condensation In the bag (or maybe as part of your layers) far more likely. I’ve observed that, for the most part, trusting the bag to help keep you heat right down to its “comfort and ease score” with small or no levels, as challenging as it may well seem if you to start with get into a frigid tent, pays off ultimately, and will often result in a snug night time’s snooze without having to handle a damp VB liner, and with little or no condensation inside the bag.
Andrej Badin on March 10, 2024 at 1:00 am Dear Andrew, thank you for a good post in addition to a lively discussion! Could you Potentially elaborate a tad a lot more on using VBL’s in relation to Over-all hygiene although staying on course for weeks and extended devoid of the chance to wash/dry apparel inside a heated shelter/building? Do you wash your sweat soaked baselayer working with cleaning soap, wring it, place it back on and carry on mountaineering, drying the garment using your entire body warmth?
I’m not worried about the lack of “waterproofness” — my shelter serves this function really well, and WP/B fabrics aren’t that watertight anyway.
(Without a VBL, perspiration would move away from your physique and through outer levels (if relevant), and then with any luck , evaporate in the atmosphere.) This entrapment of dampness has three Advantages:
If this type of mechanism exists, then VBL would preserve drinking water and electrolytes, together with human body warmth. certainly from Anything you report, below significant workload this putative feed-back mechanism is not enough on its own to control perspiring sufficiently. Potentially, though, such a mechanism could make a major big difference in the course of small effort and hard work instances such as sleeping.
usually – worst case – I suppose switching out and carrying a couple of pairs of frozen liners is much better than having damp ft for many days and nights.
generally to people who find themselves owning issues keeping heat with the standard breathable method. As well as reporting a couple of of my wonderful final results, IOW recognized reality about what took place, not concept. ( all although not less than one has said he will not trust me and also the couple of Other individuals who've claimed similar accomplishment).
right up until Andrew responds, here is my opinion. The VB employed on your own will most likely be warmer than a thin base layer, and far warmer if worn under that foundation layer.
A 2nd point I may point out is usually that although the dew point is someplace on just how our of 1’s higher apparel, sublimation takes place and this sublimation gives continual drying.
Re styles, look at trying to duplicate the dimensions of your favorite shell/raingear trousers and bottoms.
one particular exception is my toes. They are frequently so heat I feel like They're perspiring. versus a great number of who complain of chilly ft when hanging in a hammock. I Generally overlook it and just slumber with overheating ft. But when I take from the VB socks the following early morning, even though my ft do certainly come to feel toasty heat on the contact, there read more is normally no perceptible liquid.
it is actually exciting to read through the critics on the vapor barrier tactic who have not essentially expert the extraordinary performance at sub zero temperatures. In all it provides the benefit of preserving the insulating capability of down by preserving it dry, and decreasing the quantity of insulation wanted Over-all by stopping the cooling effect of insensible perspiration. utilizing a mild layer of artificial extensive underwear, then a light-weight rain fit, accompanied by hefty fleece my summertime bodyweight down negative offered in excess of adequate insulation to keep toasty heat at zero degrees. An impressive functionality. For the individuals with chilly extremities, toes and fingers, even some thing so simple as a bread bag about a liner sock and after that a heavier insulating sock will make your ft truly feel like they are increasingly being warmed by a wood stove.
The latter can make it very hard to have humidity out if it at any time manages to have in (e.g. by means of untaped seams, or immediately by way of older cloth which has shed its waterproofness). This could be far more of a concern in soaked spots. One more issue with this development is usually that yet again it is possible to only have on a base layer to mattress.
What would you endorse for standard heat sleeping versus the actual summit drive exactly where There may be additional exertion, it’s even colder/windier and it’s Considerably more difficult to shed layers easily. getting a hard time determining what my method must be.