If you push the limits of downhill speed and big air, the S-Works Dissident is for you. Thats because its the lightest, most-ventilated, and technically advanced carbon fiber full-face mountain bike helmet out there. To help make sure of it, our 3D sculpted cheekpads and 4th Dimension Cooling System keeps things airy in the heat, while the Carbon Matrix shell keeps it light enough for all-day comfort.