Cooler heads will always prevail. The new S-Works Prevail II Vents massive cooling power helps better regulate your body's temperature to keep you cooler so that you'll always be ready when your ride heats up. We took everything that the S-Works Prevail II was doing right, and did it even better. One of the greatest benefits resulted from the removal of a total of seven foam bridges from the center and sides to create more effective ventilation channels.