Instead of using a traditional total waterproof construction, the Assos rS.sturmPrinz features strategically-placed openings to increase transpiration - your body sweats even when raining, and it is important to transfer this moisture to the outside as fast as possible. This design achieves an unmatched balance between protection in heavy rain and body temperature regulation. In cold winter riding conditions it can also be used as a heavy-duty insulating shell, when worn over a jersey or jacket.