Features:Waterproofing Resistance to water is expressed in millimetres, which represent the height of the column of water wich the fabric is able to whitstand during laboratory tests before allowing liquid to penetrate.Breathability Two environments are artificially created with different hygrometric conditions and vapour penetration is measured, with the result expressed in grams of water vapour per sq meters of fabric in 24 hours. Win prooftness Lamination or coating which makes the fabric windproof