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Thank you for this post. I did wish to point out just one problem with the dialogue of dew stage and condensation. Dew position is a function of two variables: the actual temperature, and also the relative humidity. Unless of course RH is 100%, the dew point will almost always be reduce than the particular temperature.

therefore, while it was inappropriate for your early reference to cite that “which the high humidity envelope produced by VB ‘…discouraging or even halting the production of insensible sweat,’” it would have been appropriate for that reference to point out that at VAPORBA a sufficiently substantial humidity, though the production of insensible sweat carries on, its evaporation is halted, and As long as system temperature proceeds to push the production of these types of sweat, it is going to continue on to build up in a very pool.

I feel I’ve uncovered a European-centered cottage market producer of sleeping bags to build the bag as soon as I’ve picked resources and settled on a tough structure.

Your knowledge of these fabrics is inaccurate. both equally are categorized as “water-resistant-breathable,” that is a smoke-and-mirrors time period for a cloth that supposedly prevents dampness from passing by it though also allowing dampness to pass through it. Huh, what? That’s identified as marketing and advertising. In point of fact, these fabrics do breathe, albeit not just about and also, say, a base layer shirt or the lightweight shell fabrics the thing is on most sleeping luggage now. So when you perspire at nighttime, this perspiration will pass through the interior material, into and ideally through the insulation, and through the outer material, in which it can evaporate.

would it not truly, considering that the dew issue would be someplace inside the sleeping bag’s insulation? I might surmise that the vapor would ‘want’ to vacation appropriate from the clothing process and outward along the temperature and humidity gradients to some (dew)point uncovered deep in the sleeping bag. Unfortunately for Mr. Vapor nonetheless, the outward sure h2o vapor would velocity correct in to the proverbial brick wall when it attained the sleeping bag’s waterproof inner shell. Maybe then a VBL-suit would not be necessary at all–just an outer shell over the puffy which was breathable still markedly ‘watertight’, e.

Andrew Skurka on March 21, 2014 at ten:07 pm at the very least one facet from the bag would want for being breathable, or else the bag would resist lofting immediately after staying compressed, or compressing soon after remaining lofted (since a non-breathable cloth doesn't let air to go through it, so in essence air movement would be restricted to the seams).

I understand which one particular I normally selected if there is any probability of not remaining warm ample for multiple nights With all the insulation I have with me. Or, if I'm just needing to lower insulation bulk and body weight and ensure I don’t loose loft evening following night time.

a lot more than the moment, in the course of hiking or perform, following acquiring substantially reduced the conventional number of insulation I might have needed- but not to zero- I over heated and generated an excellent little bit of sweat. Would I happen to be Okay with zero insulation, producing little if any sweat? I don’t know, but I doubt it. VBs actually increase to the warmth.

There was also point out by Kate of sewing 2 Place blankets with each other to create a sleeping bag VB liner. Andrew felt it wouldn't be a good suggestion as a consequence of lack of sturdiness and because it might cause sweat and trap all moisture resulting from not being breathable. Okay, I see that It might be fragile.

I try to remember Listening to regarding your epic trek across Northern Minnesota. I do think I used to be Winter season tenting inside the Boundary Waters around the time you were being passing by means of.

Andrew Skurka on December 28, 2022 at five:36 pm I usually buy the Altitude liner, because it’s not A lot more expensive or heavier than the opposite versions, as it gives you the choice to go lessen as opposed to Other individuals, and since there’s an uncomplicated Option when you don’t want such a warm liner (you are taking from the gloves and clip them to the carabiner on the shoulder strap).

Trouter on February three, 2016 at ten:fifty three pm Andrew, thanks to the in-depth rationalization from the VBL procedure. I Wintertime camp in northern Minnesota, Hence the temps certainly warrant a lot of imagined on gear, apparel, and techniques of preserving heat. I’m taking into consideration a VBL liner from Rab (url under). My query is concerning the morning Once you’ve slept having a VBL bag or VBL outfits.

for your AT in Wintertime I don’t Imagine you would like the Altitude liner, Even though it weighs simply a tiny bit in excess of the Hybrid Variation, so I’d in all probability just Select it — since it is artificial insulation, its warmth will lessen with use.

Our bodies are designed to lose a particular degree of dampness, even though sleeping and never overheating. Hence, in my view, the optimal sleeping method is just one which allows for these “schedule” moisture loss with no compromising its insulating properties.

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