Protective clothing certified according to EN 343 protects against precipitation such as rain or snow, fog and ground humidity. The garment and the seams are tested for their water resistance, but also water vapour resistivity.

The garment is classified according to water-resistant properties, and the water vapour resistivity gives the recommended working time.

X: Resistance to water penetration ( max 3 levels)
Y: Water vapour resistance - Breathing properties (3 levels)

Resistance to water penetration is the most important quality for adequate protection. The resistance to water penetration is expressed in kPa but a more understandable expression is in millimetre water column.

The classic and easy-to-understand unity for breathability was defined in g/m² per 24 hours. However, EN 343 uses a water vapour resistance value Ret (m². Pa/W), which is measured by the 'so-called' skin model test ISO 11092. For a clear understanding the higher the Ret value, the higher the resistance of the fabric, and the less vapour passes through in these particular lab conditions (static, ISO temperature 35 В°C).

Breathable garments evacuate the perspiration away from the skin and from the garments. When too much humidity has accumulated in the clothing, condensation occurs and the skin feels clammy.

In cold atmospheric circumstances one risks cooling down too quickly; otherwise, in warm circumstances, the rhythm of the heart will increase and after some time there is a risk of heat stress.