The castelli velo vest has all the water and wind protection of a proper jacket combined with the ventilation of a vest this vest has been geometrically designed to the dimensions of your body for a superior fit and to allow unrestricted movement the longer cut provides lower body splash protection the non bulky form easily packs away small for transportation and can be whipped out and put on for exactly when you need it when you no longer need it just stash it away until next ti