The European Standard ‘EN 343:2019 Protection against rain’ distinguishes between four classes of a garments performance, based on seperate water-proofness and breathability capabilities. PROTECTION AGAINST RAIN Waterproof and breathable. Craghoppers Expert garments conform to class 3:1. WATERPROOFNESS Waterproofness of the material is measured by testing the level of resistance to water penetration (Wp). Hydrostatic pressure is measured in a column of water (in Pascals) until water penetrates the fabric. BREATHABILITY The water vapour permeability or breathability of a garment is tested by measuring its resistance to water vapour. The lower the Ret value, the higher the breathability of the material.
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