THE VO-580 IS MADE OF SALOMON'S NEW 3-D AIR MESH FABRIC THAT IS WATER- RESISTANT AND TRAPS AIR, PROVIDING INSULATION, BUT BREATHES WELL SIMUL TANEOUSL Y. THE VO-580 HAS VENTILATION HOLES IN THE HOOD AS WELL AS t1ESH PANELS UNDER THE ARMS. WEAR IT UNDER A WATERPROOF SHELL IN RAIN AND AS A SOFT SHELL ANY OTHER TIME.