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The warmth of a down comforter depends not only on the fill power, but also on the quantity of fill. So the difference between a comforter with 550 fill power down and a comforter with 700 fill power down is that the 700 fill power down comforter will be lighter for the same warmth rating.
Down rated 500–650 in 3 /oz (290–380 cm 3 /g) is warm enough and light enough for most conditions, and 800–900 in 3 /oz (460–520 cm 3 /g) fill is used for very lightweight and/or very cold-weather gear. Down is warm, lightweight and packable. If well cared for, it retains its loft up to three times longer than do most synthetics. [38]
However, down still has a better weight to warmth performance when dry. [13] Unlike down, PrimaLoft is able to retain 96% of its insulating capability when wet by maintaining its loft, and therefore is used in clothing and equipment intended to be used in cold, wet conditions, such as jackets, parkas, gloves, sleeping bags and footwear. [14]
Down is favored among hikers and backpackers because it can easily compress into a small size to fit in a backpack, and it has the highest warmth to weight ratio. The down's loft in the jacket is measured with the term "fill power" which represents the number of cubic inches one ounce fills.
Same as above, plus suit jacket: 0.96 Same as above, plus vest and T-shirt: 0.96 Trousers, long-sleeved shirt, long-sleeved sweater, T-shirt: 1.01 Same as above, plus suit jacket and long underwear bottoms: 1.30 Sweat pants, sweat shirt: 0.74 Long-sleeved pajama top, long pajama trousers, short 3/4 sleeved robe, slippers (no socks) 0.96
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