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Also, some down jackets are labelled as "downproof" to indicate that it will leak down feather less than a typical down jacket. [2] Real down has better warmth to weight ratio and compressibility compared to synthetic, but synthetic down has better water resistance. They are both equally durable. [4]
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. This original non-woven insulation ...
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 ]
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Clothing insulation is the thermal insulation provided by clothing. [ 1 ] [ 2 ] Even if the main role of clothing is to protect from the cold, protective clothing also exists to protect from heat, such as for metallurgical workers or firemen.
Down insulation is rated by fill power, which is the number of cubic inches displaced by a given ounce of down (in 3 /oz). To measure fill power, an ounce of down is placed into a graduated cylinder, and a small weight is dropped in on top of it; the volume below the weight indicates the fill power. Eiderdown has the highest fill power, at 1200.
The insulation qualities of clothing materials are determined by the amount of "dead air" they can hold. The air is held in the voids inside the material itself as well as in the gaps between the clothing layers. Of the natural clothing materials, fur and leather provide the best insulation.
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