This new cellular structured fabric is truly revolutionary. Its proven that air is the best Insulation and Insultex incorporates countless micro air cells. These individual pockets trap air and do not allow it to escape. This is the key to keeping people warm. Insultex simply reflects the bodys radiant heat back to the body. Other properties possessed by Insultex include being very thin, lightweight, flexible, waterproof, windproof and buoyant. A factual example of the efficiency of Insultex is as follows: * 1 layer of Insultex protects a person to 25 degrees C (-13 degrees F).