Temperature rating per inch of loft?

[TrailArchitect]

Anyone know a rough temperature rating per inch of loft? I've been searching around for a while and can't find anything. Hope someone can help me out. Thanks

[MAD777]

According to the highly respected sleeping bag manufacturer's tables, they claim an 18*F drop for every inch of loft starting at 67*F.

Rounding off their numbers gives the following:

Rating = 70 - (20 x loft)

(Temperature is Fahrenheit and loft in inches)

[TrailArchitect]

According to the highly respected sleeping bag manufacturer's tables, they claim an 18*F drop for every inch of loft starting at 67*F.

Rounding off their numbers gives the following:

Rating = 70 - (20 x loft)

(Temperature is Fahrenheit and loft in inches)

Thank you! Very Helpful!

[vwgerald]

shug put this up on a previous similar post.

[TrailArchitect]

shug put this up on a previous similar post.

AWESOME! Thank You So Much!

[Jazilla]

One thing you have to remember, is how they got these measurements. Shugs chart is what I believe every cottage business models after. The flaw in this chart is the numbers are take from most high end down sleeping bags. Great uou say cause our down quilts do the same job but with less right. Here is the problem. Sleeping bag manufacturers rate thee bag assuming the user is wearing addition clothing layers. That is to say if you used a 20* sleeping bag naked it wouldn't get you to the 20* make. This is something to keep in mind if your a cold sleeper, your 2.5" loft may not keep you warm to 20* if your only wearing boxers.

[Curmudgeon]

Great info here. Subscribed so I won't lose it!

[MedicineMan]

The shell also has influece, though small in most applications but maybe not in others,
an example is m50 which can act as VBS to a certain degree.

The cut of the quilt also can influence, that is differential cut or not.
And how heat is contained at the ends-sewn footbox or not and the top with or without a method of cinching down around the head/neck can also increase or decrease the overall warmth or lack of.

Then there is the fill quality of the down.
and so on

[MotoHanger]

I had saved a link at one point on this topic, it was on HF before I was educated in subscribing to threads to find them again. But there was extensive talk and apparently your loft to warmth varies by material.

Assuming you're talking down (as all good hammockers yearn for down), but if you are talking about Climashield or some other synthetic there is a specific factor that equates in to the warmth rating.

And of course I can't find that thread now...argh! But I'll keep looking and post it on this thread if I can locate it.

[MotoHanger]

Here is the thread I was thinking about...skimming over it, it seems to be specific to Climashield APEX...but some of the technical calcs based on CLO ratings may be of some hlep.

https://www.hammockforums.net/forum/...PEX%2C+Down%2C