Mach1 stands for pure performance and precise fit with an ultimate level of customization. High performance skiers looking to up their game will appreciate the directness of the Asymmetrical Power Transmission shell. Built on a high-volume, 103 mm wide last and supported by the C.A.S. fit system, the HV 120 delivers a level of power, comfort and control that has never been seen in a high-volume boot. The HV 120 lives up to the Mach1 name.