This jacket has been validated in a shower test under 60L of water /sqm/h for 2h:It protects you from a shower equal to 12 cm of rain in 2hThe fabric of this jacket has a waterproof rating of 2000mmWe measure a fabric's resistance to water pressure, expressed in terms of the height of a water column in mm (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 2,000 mm water column.