The characteristics of cotton fabric make it an excellent fabric for warm or moderate weather. It absorbs moisture easily, so you don’t feel sweaty. It is soft to the touch, so it feels nice against the skin, and it does not hold in heat like wool or synthetics do.
Sadly, these same characteristics can become deadly as the weather turns colder and damper. Cotton will keep your perspiration against your skin, and as soon as your activity level drops, you’ll have cold liquid against your skin—thus, chilling you. This will constantly sap heat from your body and lead to hypothermia, which can kill you. So, cold-weather clothing made from cotton, such as cargo pants, blue jeans or flannel shirts, should be left at home and not worn.