The Tecnica Mach1 MV 120 Ski Boot connects the shell to the cuff through T-Drive, an asymmetrical link built specifically to keep a stiff flex from stacking up abruptly or harshly. At a 120 rating, that connection carries power through the turn in one continuous motion instead of a sudden stop-and-go feel. The C. A. S. shell and liner mold to a medium-volume foot for a precise, out-of-the-box fit that holds up through a full day on the mountain. What Our Gearhead(R) Experts Are Saying:"I've skied 120-flex boots that feel like they run out of travel all at once, but the T-Drive connection on the Mach1 MV 120 keeps building through the whole turn instead of stopping short."