c_change™ is based on an example from nature. As a matter of fact, it copies the similar effect of a fir cone opening and closing in response to different weather conditions. The c_change™-membrane reacts to different prevailing conditions. In doing so, not only temperature but also air and body moisture are balanced out. At high temperatures, or during aerobic activity, the structure of the c_change™-membrane opens as body moisture levels rise. Excess heat can escape to the outside air. Due to the lower level of body moisture development in cold weather or during inactive periods, the structure of the membrane condenses, retaining the heat directly on the body. Shivering or chilling is effectively prevented.