Fast and light tourists who move like the wind on the skintrack but still want a powerful boot during the descent, the Black Diamond Prime Ski Boot is your boot. The Prime drops weight by losing the fourth buckle and adopting Black Diamond s Efficient AT Light Boa Liner but maintains power with the Triax Pivot Frame Technology, which locks firmly into place when buckled for downhill control. Get down with your bad skinning self with the Prime's full 40° of unrestricted fore/aft movement and Locking QuickWire buckles that stay put and out of your way in the open position.