This paper concerns multilayer clothing systems whose outermost layers consist of a somewhat ermeable exterior sheath and a layer of light insulating battin. Wind-tunnel tests show that the wind-induced heat loss through such systems can be greatly reduced by introducing a layer with low resistance to airflow between the sheath and the underlying batting layer. The low resistance layer acts as a bypass, allowing air that has penetrated the somewhat permeable sheath to flow downstream with little or no penetration of the batting layer. The results have been corelated intoa form suitable for guiding of design decisions.
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