Black Diamond Prime Alpine Touring Ski Boots 2011: The Black Diamond Prime Touring Ski Boots are Black Diamond's premier lightweight alpine touring boot-designed to tackle the world's most challenging ski mountaineering routes or simply to save your legs for one last powder lap. This is Black Diamond’s lightest alpine touring boot, featuring a unique 3.5-buckle design that skis with the stiffness and control of a 4-buckle boot. Its state-of-the-art construction keeps weight to an absolute minimum, while Black Diamond’s revolutionary Pivoting Cuff Technology delivers the ultimate combination of freedom of motion in walk mode and instant power transfer in ski mode.