The Tecnica Mach Sport 100 HV is a great ski boot option for a strong skier searching for the perfect mix of performance and comfort. This boot was made for the intermediate to expert skier who has a medium to wide calf and shaft of the leg, as well as a medium to wide forefoot with 103 last. Tecnica's Dura-Tec Construction adds durability by reducing the chipping and scratches than many boots will see over an extended period of time. The NFS (Natural Foot Stance) Celliant Liner keeps your feet slightly abducted the way you would naturally stand for easier energy transmission and improved comfort, while also being able to be heat molded to accelerate the breaking in process. Celliant uses 13 thermoreactive minerals that transfer body heat into infrared energy to help add extra warmth to the boot. Complete with an Upper Cuff Buckle that has a Ratcheted Adjustment that helps you fine tune the fit across your leg. C.A.S. - Custom Adaptive Shape Shell, NFS - Natural Foot Stance Celliant Liner, Lift Lock Buckles, Dura-Tec Construction, Adjustable Top Ratcheted Cuff Buckle, Double Quick Instep, 35mm Powerstrap, Best Fits a Medium to Wide Forefoot and Medium to Wide Leg Shape, Ski Boot Width: Medium Wide (102-103mm), Category: Downhill, Ski Gear Intended Use: All Mountain, Skill Range: Advanced Intermediate - Expert, Model Year: 2022, Product ID: 573254, Model Number: 10187000 255, GTIN: 0888341667867, Calf Volume: Medium, Instep Height: High, Buckle Count: 4, Flex Adjustment: No, Forefoot Width: 103mm, Ski/Walk: No, Flex: Stiff, Warranty: One Year, Cuff Alignment: Dual, Actual Flex: 100