- Oct 5, 2018 at 3:50 pm #3558522
Matt DirksenBPL Member
@namelesswayLocale: Mid Atlantic
A few weeks ago, I stumbled across this 2016 NIH publication about supplemental heating inside of sleeping bags. I didn’t know if it had been brought up before so I thought I’d pass it on:
While the introduction of supplemental heating to the extremities is not new to many of us, I found this statement somewhat alarming, when discussing the current sleeping bag testing methods:
”These studies indicated that the operating temperatures defined for sleeping bags provided insufficient protection at the body extremities.”
My take away: regardless of a bags temp rating, it’s a good idea to overcompensate for the hands & feet no matter what, since the testing methods don’t take “localized thermal comfort” into consideration.
(It appears my feet are saying “DUH” in this very moment)
Furthermore, if a bag company made a design which actually DID help the feet out, I’d never know it from the EN ratings. It would likely appear as a heavier bag to other bags with the same FP and temp rating.Oct 5, 2018 at 5:44 pm #3558541
Dale WambaughBPL Member
@dwambaughLocale: Pacific Northwest
Interesting. You would think that a design with extra loft at the feet would be easy and very marketable. Even doubling the down at the lower 12″ or so wouldn’t add much weight to a bag. Even quilts could be adapted that way. Personally, my head rarely gets cold, and generally tends to be too hot.Oct 5, 2018 at 6:53 pm #3558557
Todd TBPL Member
@texasbbLocale: Pacific Northwest
Is this a surprise? I’ve always carried sleeping socks and gloves. The socks are more important than the gloves.Oct 6, 2018 at 1:30 am #3558630
Down booties… Lighter than socks.Oct 6, 2018 at 7:57 am #3558656
Mark FowlerBPL Member
My feet are like furnaces. Even if I am wearing my puffy under the quilt I usually have bare feet or at best a very light pair of socks.Oct 6, 2018 at 12:18 pm #3558666
>>Down booties… Lighter than socks.
Love my GFG down booties! I prefer the bootie approach to bumping up the fill in the footbox as it makes the sleep system more adjustable.
>>My feet are like furnaces.
Lucky you…for sleeping anyway :)Oct 6, 2018 at 1:14 pm #3558668
Tipi WalterBPL Member
The problem with feet on a winter trip is they just don’t start getting cold in the tent when it’s bed time—they often are cold hours before sleep when in camp doing camp chores or cathole visits or anything else.
When it’s bedtime they sit down in the footbox of the bag and remain cold and numb for several hours—no matter how low rated your sleeping bag is.
Last year for the first time I started carrying Hot Hands pouches and are used on bitterly cold nights and mornings when I need my hands and feet to function and stay warm. For a typical 21 day winter trip I take about 6 two-pack pouches. Once used they can be ripped open and the iron contents scattered in a firepit and the empty paper pouch burned.
My winter mantra is, “It’s All About the Hands and Feet” and this certainly holds true the older I get. Warmth packets are a concession to advancing age.
Oct 6, 2018 at 2:42 pm #3558677
- This reply was modified 2 months ago by Tipi Walter.
Paul WagnerBPL Member
@balzaccomLocale: Wine Country
Alpaca socks, purchases in a Street market in Peru for $5. AmazingOct 6, 2018 at 3:08 pm #3558679
Jerry AdamsBPL Member
@retiredjerryLocale: Oregon and Washington
If your body is a little short of enough heat to keep the core warm, then heat (blood) will be restricted to the feet and hands so they’ll get cold
My feet were a little cold so I wore booties, then I got a warmer sleeping bag and I didn’t need to wear the booties
Or, like they say, “if your feet are cold, put on a hat”
But wearing booties is a good solution too, maybe lighter than a heavier sleeping bag.Oct 6, 2018 at 3:30 pm #3558686
d kBPL Member
“My feet are like furnaces”
Mine, on the other hand, are like small refrigeration units.Dec 5, 2018 at 7:20 pm #3567562
Diane “Piper” SoiniBPL Member
@sbhikesLocale: Santa Barbara
I have discovered the cure for being cold. It’s called menopause. It can be 20 degrees, my water bottles are freezing out in the vestibule, I’m shivering and my feet are frozen and then suddenly…! Emergency! Throw my sleeping bag off and relish the delight of the cool air against my skin. Then suddenly…! Emergency! Throw the sleeping bag back on before I freeze to death. Good times.Dec 6, 2018 at 4:13 am #3567738
Jenny ABPL Member
@jenniferaLocale: Front Range
Diane, yeah…been there. Mixed blessing!
Interestingly, one of the big selling points for many of the big name sleeping bag manufacturers for their womens’ bags is more insulation in the toebox and torso areas, since studies have supposedly shown that our extremities tend to lose heat more quickly when we get cold, which I interpret as keeping the babies alive and to heck with the carrier. That’s well and good, but as others have commented, if your feet are already ice cubes when you get into a sleeping bag, you are just insulating ice cubes, not warming them. I have successfully used the air-activated hotpocket things on occasion, but I prefer to jog in place or do jumping jacks before climbing into my bag for the night, just to get circulation going. That helps as much as anything.Dec 6, 2018 at 9:33 pm #3567834
D MBPL Member
@farwalkerLocale: What, ME worry?
Hot water in a bottle….SUCH luxury!! :-)) I’ve always been “popsicle toes”.Dec 7, 2018 at 1:53 am #3567877
Shane CBPL Member
I think hot bottle is the best option if you have the fuel to spare, I always carry a fresh hot hand pack for emergency but have never had to use one.
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