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How about titanium chainmail
Thermal conductivity of electrically conductive foam 0.039 [W/(mĚK)]
Hollow Fill Fibre Insulation ... 0.042
Air is a reasonably good insulator if it can be blocked from moving. And, thus, fluffy insulation blocks air movement, and uses it to insulate. A good "wind breaker" is also surprisingly insulating due to blocking the wind.To get fluffyness without insulation, you will have to figure out how to maximize the air flow, while maintaining the fluffyness. For example, a tangle of fishing line might be fluffy, but wouldn't block the wind, and thus wouldn't be insulating.You could also look for materials that have very high heat conduction. For example, copper wool would likely feel cool to the touch as long as the ambient temperature is not too high.