With the rssturmprinz evo windproof jacket the objective was to create the ideal rain and wind protective jacket for high performance cycling no holds barred and no corners cut by the accountants however assos aim was not to make a 100 waterproof jacket why not because 100 waterproof also means 100 impermeable sweat builds up and cant escape not what you want the evaporation process must be proactive it mustnt be slowed excessively by your protective sh