Stay dry, stay comfortable, stay healthy, wear drytex.
For any fabric to be considered fully waterproof it must be able to withstand the pressure of a column of water 1000mm high without leaking. This is classed as a hydrostatic head rating of 1000.
drytex hydrostatic head rating > 3000.
Water-vapor permeability indicates breathable performance of textiles and is a measure of the passage of water vapor through materials.
drytex >3000g/m²/24hours, therefore drytex allows 70%perspiration to evaporate.