Performance, comfort and convenience join hands and live happily together in the Tecnica Mach1 MV 105 W Ski Boots, which is good news for expert skiers who are "over" the pain and hassle of trying to make their boots work. Tecnica's formula for success hasn't varied much - this is still a C.A.S. polyurethane boot with a polyolefine cuff, but the T-Drive fiberglass spine really adds some snap to the boot when it's being driven hard. A moldable Thermoforming Collar lets the cuff adapt to fit larger calves, and the Performance C.A.S. liner with Celliant® delivers the comfort you deserve.