Down
Facts and Performance Sleeping Bags
WHAT DOES FILL POWER ACTUALLY MEAN?
Roughly speaking fill power is a measure of how
much volume is taken up by a given quantity of down. The higher
the fill power the loftier the material, loft meaning the amount
of air held within the material, which translates into insulation
(still air is a great insulator remember).
So if we were to compare the fill power of say one pound of potato
peelings with one pound of cotton wool balls, the cotton wool would
win as it would take up a much larger volume, (something worth remembering
if you're forced to make your own sleeping bag out of household
items).
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Facts and Performance Sleeping Bags
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