Inspired by the Inferno, the medium-lasted (100 mm) Mach1 has a you-have-to-try-it-to-believe-it new highly detailed anatomically shaped liner and shell (the precise heel contour alone is worth trying on a pair) called C.A.S. system. The traditional four-buckle boot has a 130 flex and Tecnica’s i-Rebound or a metal-to-metal connection between the cuff and lower boot for rear support and rebound. The Mach1 has Technigrip soles or sold separately, pre-canted soles for hard to fix alignment issues.