Black Diamond Quadrant Ski Boots - Men's LEFTnotruc(Lightweight (1.72 kg, 3 lbs 13 oz each) alpine touring boot with 4 buckles and maximum stiffness,500) Triax Pivot Frame with Flex 120, 40&deg; of resistance-free touring motion and locking Quick Wire cuff buckles New plastic liner tongue for a smooth, evenly distributed flex, plus an improved power strap New Efficient Fit AT Liner with 1: 1 Boa closure system, improved fit and articulating zones for ultimate, all-day, long-lasting touring comfort Rockered, rubber outsole with integrated tech inserts provides dramatic grip and durability