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The U.S. Army was primarily interested in a synthetic insulation that would be comparable to goose down in weight, compressibility, and warmth, but also retain heat while in the presence of moisture. In 1985, United States Patent 4,588,635 for "synthetic down" was filed and ultimately approved in May 1986.
Thinsulate is a brand of synthetic fiber thermal insulation used in winter clothing. The word is a portmanteau of the words thin and insulate , trademarked by 3M. [ 1 ] The material is made by the 3M Corporation and was first sold in 1979. [ 2 ]
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.
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The down of birds is a layer of fine feathers found under the tougher exterior feathers. Very young birds are clad only in down. Powder down is a specialized type of down found only in a few groups of birds. Down is a fine thermal insulator and padding, used in goods such as jackets, bedding (duvets and featherbeds), pillows and sleeping bags ...
Both for and against. Cats will walk through their litter box after using it then climb directly on your pillow. Dogs shed and drool like there is no tomorrow. But goddamn it the cuddles are so ...
Furthermore, synthetic insulation tends to break down faster than its natural counterpart. Down fill weighs less than synthetic and retains heat better, but usually costs more. Down must be kept dry; a soaked down sleeping bag may provide even less insulation than no sleeping bag at all, leading to hypothermia. Newer, more technically advanced ...
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