Developed by Alpine, Alpine-tex is the best waterproof material available and it also absorbs humidity.  It is made of various fabrics such as high density polyester, nylon, T/C and so forth and it is coated with an ultra thin poly urethane film, which offers superior waterproofing, coldproofing and absorbtion of humidity.  
Alpine-tex, with its light and smooth feeling, is the ultimate concept line for light-weight materials and is windproof for optimal trekking conditions. It is also very practical for trekking in all four seasons.