Staying warm is a matter of heated air (heated by the body) contained in a space surrounding the body. When blankets lay on a bed undisturbed for days, they loose all of the air between them and there is nothing for the body to heat. After crawling into bed at night, put an air layer back into each space between the blankets and don’t forget to do it for your children also.
Beginning with the first blanket, just flap it, (lift and let it fall back down.) capturing air, then do the same with the next blanket until they are all flapped. When layering blankets, put the down comforter near the top and as a barrier of heat loss by conduction, cover everything with a thin Polar Fleece blanket.
Body heat is captured by the kind of covering. Fur is warmest because there are thousands of tiny air pockets, (hair is the perfect example, your head stays warm at night). Polar bears walk on ice because the bottom of their paws are covered with fur. Wool has little barbs on the fiber that capture air. Alpaca is not wool, it’s actually fur. Feathers capture air in the same way and the down in comforters is the fluffy little under feathers of ducks and geese.
A modern fabric that’s as warm as fur is Polar Fleece… it’s made from recycled plastics and has the added warmth of a heat loss barrier.
Mattress pads of wool, sheepskin or feathers also retain body heat and add a barrier to conduction heat loss.
Camping and survival gear includes a foil sheet. Wrapping in this locks body heat into the spaces and, with little cost, prevents heat loss by evaporation and convection.
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