The Prime is 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 our 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 our revolutionary Pivoting Cuff Technology delivers the ultimate combination of freedom of motion in walk mode and instant power transfer in ski mode. 

• Lightweight (1.64 kg) 3-buckle alpine touring boot with 4-buckle performance
• Triax Pivot Frame with Flex 110 and unmatched 40° of resistance-free touring motion
• Efficient Fit AT Light Liner with lightweight Boa closure system
• Rockered, rubber outsole with integrated tech inserts provides dramatic grip and durability