equally as VB calls for cautious thermal administration, it’s also quite probable to deal with the quantity of moisture buildup inside of a non-VB sleeping method by preventing overheating. In that regard, your place about wearing additional insulation layers less than your sleeping bag is nicely taken: that added layer results in an additional temperature gradient in between you and the insulation while in the bag, earning condensation In the bag (as well as within your layers) much more very likely. I’ve identified that, Generally, trusting the bag to maintain you heat down to its “consolation rating” with negligible or no levels, as challenging as it might feel if you 1st go into a more info frigid tent, pays off ultimately, and will usually cause a snug night time’s rest without needing to contend with a damp VB liner, and with little or no condensation Within the bag.

I bought some Aquatherm three/four leggings for summer months windsurfing from the Southern Portuguese Atlantic, but uncovered them somewhat also cold and haven’t utilized them since. I also have some Aquatherm wader socks. possibly they’d be truly worth dusting off for use as VBL socks?

Also, the evaporative cooling that usually takes put close to your skin is An important cooling variable, and will become a lot more essential at Serious chilly temps. Any day you retain this stuff from happening, by making use of a vb to keep all of this vapor or sweat close to Your whole body and out of your respective insulation, is probably gonna be a hotter working day.

As on your torso and legs meticulous exertion control and venting are vital. 1 benefit of the vapor barrier is early detection of overheating for the level of exertion and insulating levels getting worn. The good news is that dampness by no means reaches your insulating levels.

as the temperature across your sleeping technique is not really frequent, but somewhat a gradient, the dew position will Furthermore be a gradient, and if condensation will take place inside your bag will depend each on that gradient and on the level of moisture entering the program (i.e. the amount of you are perspiring), and also the porosity of your outer sleeping bag material.

I have done some snowshoe in excess of evening outings around seven days in Sweden/Norway. 1st vacation it absolutely was -20c in Stockholm – 25c daytime even more north and -30c some nights when tenting.

There was some loft misplaced as well. I was to some degree involved that compressing the bag to maneuver to new location could possibly clump the down in upcoming long winter journeys.

Valid points. I've also- before- felt ” disagreeably moist, sticky and clammy when I utilize a VB.”. The first time, many years back, making use of Patagonia VB socks more than some type of liner sock- likely polypro socks- I keep in mind getting to be alarmed, knowing my ft felt damp, which almost certainly meant I had been going to be cold, and my insulation was about to soak up dampness and free loft. But, right before I could thoroughly stress, it dawned on me that my ft ended up quite heat. IOW, it's possible this was Functioning as anticipated. I've felt unpleasantly clammy Another situations, but at times that intended I wasn't chilly and actually hotter, so I in some cases am ready to place up with it.

* The chilly temperature put the dew stage within your slumber process, causing h2o vapor to turn into water liquid within your technique. one example is, if it was 35 degrees exterior your bivy and 80 degrees within your sleeping bag, and In the event the dew position was forty five levels, then the transition place among h2o vapor and drinking water liquid could be someplace inside your technique.

I think that VBL’s is usually a critical and pivotal ingredient of Wintertime outfits and equipment programs—and, into a lesser degree, shoulder-year devices. Unfortunately, there is not A lot information available on VBL’s—a web search returns information and facts that is usually out-of-date, incoherent rambling, or mistaken.

terrific short article and fabulous details! many thanks a lot of for acquiring it in existence. I happen to be pushing to the Wintertime tenting A lot more and have found unbelievable advantage to utilizing a VBL.

Trouter on February three, 2016 at 10:fifty three pm Andrew, thanks to the in-depth clarification in the VBL procedure. I Wintertime camp in northern Minnesota, Hence the temps absolutely warrant plenty of believed on gear, apparel, and procedures of preserving warm. I’m taking into consideration a VBL liner from Rab (website link below). My question is with regards to the morning When you’ve slept by using a VBL bag or VBL dresses.

another working day I went out Using the layers I assumed I would wish, and when I realized I had been sweating on the last mile of the 2+ mile walk at 3-4 mph, I started zipping open layers, but I had been nonetheless noticeably damp After i got property. The next day at comparable temps, I started out out at very similar temps but with less levels, really didn’t have on much considering temps and wind chill(about one digits plus zero file wind chill), and ventilated rather promptly, but was even now moist Once i got property, but less so. But, Irrespective, I used to be hardly ever chilly and while my pores and skin was wet, my insulation was bone dry.(I was wearing the pretty economical Stephenson’s Warmlite VBs torso, ft and hands)

remaining inside the company I imagine the thought, Breath-means for comfort and ease and resistance for heat* It is all about that harmony. there are actually new materials out now that give down a operate for it’s income and mitigate dampness concerns significantly better.