The Mach1 HV 110 TD is a generous-volume boot, ideal for advanced skiers with large feet who are looking for a smooth, consistent flex. Its 110 flex combined with an Asymmetrical Power Transmission shell design offers precision and control for wide-footed skiers, or wide skiers at all. The fit is the number one priority of this HV 110, and the Custom Adaptive Shape C.A.S. technology ensures the best possible fit.