Swiss sportswear manufacturer, KJUS, recently presented a ski jacket with an integrated electronic user-controlled membrane. Thanks to the HYDRO_BOT technology developed together with Empa, the ski jacket actively pumps out sweat from inside the jacket to keep skiers dry and warm.

Efficient clothing is needed to keep the body warm and dry during winter sports. The demands placed on such textiles are high, as people sweat up to one liter per hour on their upper body alone when skiing. The new ski jacket of the Swiss premium sportswear brand KJUS removes sweat from the inner clothing and transports it out of the jacket. This eliminates the problem of cooling down after skiing, which is otherwise caused by the moisture trapped in the inner clothing. This ensures that skiers spend minimal energy to stay warm and, thus, have more energy for their sport.

This is made possible by the innovative HYDRO_BOT technology, in which two functional membranes are integrated in the back zone of the jacket, where one usually sweats the most. The technology consists of three layers: a membrane of billions of pores per square meter surrounded by an electrically conductive fabric. By means of a small electrical impulse, the pores turn into micro-pumps that actively conduct moisture away from the body quickly and efficiently. The jacket is extremely easy to switch on and off using the integrated control unit or the iPhone & Android app.

The new membrane technology solves one of the biggest challenges in the ski and sportswear sector: breathability and the problems that inevitably occur when a skier sweats at sub-zero temperatures while wearing warm, waterproof clothing. Ski jackets with normal membranes cannot transport moisture away from the body quickly enough, especially in colder outdoor temperatures, because the breathability of normal membranes quickly diminishes.

The new jacket is up to ten times more efficient than normal membrane jackets and is not affected by freezing temperatures. It can keep up with human perspiration rates in terms of breathability.