These days, almost every sleeping bag sold is given a thermal insulation numeric "rating", either the USA version or the more accurate European version. But vintage bags did not have this industry ...
There's many different kinds of "down" filling: "100% down" must legally be only down, while "down" can be any mixture containing down. Then there's "fill power" ranging from about 400 to 1200, which ...
What are the higher heat loss areas of the body and how can I reduce heat loss in those areas?
For years I backpacked without a sleeping pad, until one particularly chilly night during which I tried to heat up the earth with my paltry 98.6 degrees F (37°C). In that instance, would I have been ...