Before revision: There are thus two elements that are important in protecting from the cold: setting up a layer of still air which serves as insulation, by the use of fibres (wool, fur, et cetera) stopping the wind from penetrating and replacing the layer of warm air close to the body Another important factor is humidity.
After revision: :There are thus two elements that are important in protecting from the cold: setting up a layer of still air which serves as insulation, by the use of fibres (wool, fur, et cetera) stopping the wind from penetrating and replacing the layer of warm air close to the body Another important factor is humidity.