[at-l] Sleeping Bag Ratings Question

giniajim jplynch at crosslink.net
Sat Jan 16 15:02:48 CST 2010

That sort of explains a lot.  I've got a Kelty bag (down) that is "rated" at 25 deg.  I've been chilly in it at 40.  
  ----- Original Message ----- 
  From: Daniel Steil 
  To: David Addleton 
  Cc: at-l 
  Sent: Saturday, January 16, 2010 3:51 PM
  Subject: Re: [at-l] Sleeping Bag Ratings Question

  Only Marmot and REI sleeping bags use the European Norm (EN) temperature rating system for their bags.  The EN system is more accurate because it takes the average of three different temperature ratings ( I forget what all three are but the lowest of the three is the survivable rating) and uses the middle temperature to title the rating of the bag.  The rating they give the bag is based on having one layer on with hat and gloves.  All other companies give their ratings based on what temperature you could survive at, not necessarily what you would be comfortable at.


  On Sat, Jan 16, 2010 at 3:45 PM, David Addleton <dfaddleton at gmail.com> wrote:

    The proverbial divinity or devil "THEY" rate sleeping bags by degrees
    F or C or both, suggesting the bag is "comfortable" at the designated
    temperature. But THEY never say what, if anything, they were wearing
    when sleeping in the bag @ the designated temperature, how much
    aclimatizing to the weather THEY did before testing, or wheather THEY
    generally sleep hot or cold. If anyone knows any lynx to how THEY
    arrive at their ratings, please post them.
    NOTE: whether I sleep hot or cold depends on the recent weather I've
    experienced: IE, aclimatization: if I've experienced two weeks of
    "cold" weather, I become .aclimatized' and sleep .hot. under the
    covers I needed when it first got cold. (Cold for me is, at the
    beginning of winter, 30 something F; in springtime it's further down
    the scale, and depends on the winter temperatures I've experienced. I
    remember once when 18F felt warm.)
    Last nite I slept at Providence Canyon in Ga without a sleeping bag to
    test my cold weather "technicals" down to 30F. The feet were under
    silk liner + 2 medium weight smart wool sox. The feet whined a lot
    about the cold, I.E., my perception from the feet was "we're freezing
    down here" but intellectually I knew they we'rn't freezing. I told
    them to quit whining and slept fine. It's when you don't feel them AT
    ALL that you've got a major problem (I'm told).
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