The Mach 1 HV 110 TD hits the sweet spot for advanced-level skiers with high-volume feet who want a boot with a smooth and forgiving flex. The 110 flex is supported by the Asymmetrical Power Transmission shell and cuff design which provides both precision and control for skiers with wider feet or larger overall frames. Fit is priority number one in the HV 110 and Custom Adaptive Shape C.A.S. technology is the way we achieve it.