Thinsulate
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Thinsulate is a synthetic fibre used for thermal insulation in clothing. The word is a portmanteau of thin and insulate, and is a trademark of the 3M Corporation. The material was first sold in about 1980.
Thinsulate fibres are much thinner than the polyester fibres normally used in clothing insulation, allowing them to create a dense, tangled mat that reflects radiant heat and traps air while allowing moisture to escape. The manufacturer claims that, for a given thickness of material, Thinsulate provides 1 to 1.5 times the insulation of duck down, while being much less water-absorbent and much more resistant to crushing.
