Cooler heads will always prevail. The new S-Works Prevail II Vent's 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. These expanded channels move air across your head 18% faster than the original Prevail II. The faster air moves across your head the faster heat is whisked away from your head and the cooler you remain—it's called ""convective heat transfer"". This all adds up to the coolest helmet we've ever made.