| http://www.w3.org/ns/prov#value | - And once you break even the slightest sweat, staying warm can be difficult.It also helps to have clothing that holds onto your own natural body heat. ???What you want and need from your clothing is an ability to trap air in some manner,??? says Brian Beechinor, a product designer with the outdoor company Cascade Designs. ???It turns out that air works as a pretty good insulator.???MORE: Winter Coa
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