According to the European standard EN343, for materials and products to be considered waterproof they need to meet specific criteria.
This criteria includes the amount of water pressure (psi) they can withstand before leaking or an “mm/24 hours” rating which equals the
amount of rainfall a fabric can withstand in a single day before water starts to leak through.
Equally important are the abrasion resistance quality of the membrane, the coating and waterproof quality of the seams and
zips – these should be laminated or welded.
The slightly water-repellent wind protection is achieved primarily through a membrane. The windproof
soft shell material provides perfect protection against the dangerous wind chill effect, due to the
convective dissipation of body heat, which as a result produces a higher rate of evaporation.
Breathability refers to the ability of a man-made fibre or natural fibre to release the body's own water vapor.
Breathable fabrics allow for quick drying already during use and thus prevent both heat build-up from the body under the fabric
as well as cooling due to dammed up moisture.