This is a layer of insulation that insulates and protects you from the cold. The insulating layer helps in the retention of heat emitted by your body. The more heat is absorbed by this layer, the warmer you will be. The second layer will create a layer of warm air that is trapped between it and the first layer of clothing. The aim is for a thin layer as the second layer. Several thin layers that trap heat between them is more effective than one thick layer against the skin.
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