Product descriptionKEY FEATURES Custom Adaptive Shape C A S Shell is pre shaped for ergonomic comfort but is also designed for Thermo Shaping allowing for enhanced customization of fit Asymmetric Power Transmission allows the boot to increase both control and sensitivity Painted Base provides an anti scratch finish for greater durability High performance and high volume the Tecnica Mach1 120 HV Ski Boot offers big performance for big feet Thats because theyre part of Tecnicas Mach1 line of boots all built around providing specific subsets of skiers with gear designed to meet their specific needs In the case of the Tecnica Mach1 120 HV that means Asymmetric Power Transmission By making the inner walls of the shell thicker and the outer walls thinner your boot becomes more responsive and agile while still providing the support and power you need for carving hard SPECSLast Width 103Skill Level ExpertFlex Stiff