We measure the fabric resistance with a water pressure expressed in mm of water column ( tests based on the ISO 811 norm). The higher the pressure, the more the fabric is considered waterproof. A component with a 2000mm waterproofness will resist pressure of 2000mm of water (the equivalent of a two-hour rainfall).
The water-repellent capacity of a fabric is its capacity to let the water slip on its surface without absorbing it. The water-repellency capacity is procured by a treatment on the outside of the fabric. This treatment needs to be renewed during the clothing’s lifetime (we suggest every 3 washes). All Quechua raincoats benefit from a water-repellent treatment.
Each jacket is validated in a shower test under a certain amount of litres per m2 per hour during a few hours (according to specificities). This test recreates a more or less important storm in the mountains.
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Capacity of the product to release the vapor created by the body. In addition to the breathability of the fabrics used, Quechua is developing technical solutions (zippers, aerations, mesh…) that improve the overall ventilation of all our jackets made for hiking. These ventilation systems allow for temperature regulation inside the jackets and to facilitate evacuation of sweat formed by the body during physical efforts.
To know if a fabric is breathable, we measure its RET evaporation resistance ( test based on the ISO 11092 norm). The lower the resistance, the more the fabric allows the vapor generated by the body in activity to be released, thus making it more breathable.
To make a fabric waterproof, there are two solutions:
The coating: it's a waterproof material spread on the inside of the fabric. It stops the penetration of water inside the item but can release the vapor formed by the body during physical efforts so you remain dry.
The membrane: it is a film applied on the inside of the fabric. It is waterproof and stops water coming from the outside but evacuates the sweat created by the body as it moves. The membrane is more flexible and durable than the coating.