The fabric of this jacket has a waterproof rating of 2000mmThis jacket has been validated in a shower test under 60l of water/m²/h for 1h it protects you from a small downpour, i.e. 6cm of rain in 1hWe measure a fabric's resistance to water pressure expressed in terms of the height of a water column in mm (the ISO 811 standard)The higher the water pressure, the more waterproof the fabricA component with a waterproof rating of 2,000mm can withstand the pressure exerted by a 2,000mm water column.