A ragtag community of teenagers band together to revolutionize the world of surfing. Kelly Slater, Rob Machado, Shane Dorian, Taylor Knox, Kalani Robb, Benji Weatherly, Ross Williams, Pat O’Connell and Taylor Steele are the Momentum Generation. From directors Jeff and Michael Zimbalist, and executive producer Robert Redford, Momentum Generation premieres on December 11 on HBO.