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The European Standard a fabric must meet to be classified as waterproof is a hydrostatic head rating of 1,500mm. Hydrostatic head is a fabric's resistance to water pressure equivalent to a column height of water. Whilst a hydrostatic head of 1,500mm will keep out heavy rain, it will not stand up to the increased pressure put on a fabric in general use and by rucksacks etc. On average, outerwear fabrics tend to have a hydrostatic head of 10,000mm and above.