The Tecnica Mach 1 120 MV is a powerful boot for aggressive skiers who has a medium to narrow foot and leg shape. Tecnica's CAS (Custom Adaptive Shape) UltraFit Pro Liner uses Microcell Material in the heel and ankle pocket that can be heated or punched for that perfect grip to prevent any slipping while you are flying down the mountain. The CAS Shell has dimples in strategically placed zones that make this boot a dream to work on for a skilled bootfitter to give you a true custom fit. A 45mm Power Strap keeps a tight wrap across your shin to add extra rebound and power. The Quick Instep has a softer plastic across the top of your foot that allows for easy entry and exit. Tecnica's i-Rebound Construction has metal on metal connection points that increase the forward flex resistance, rebound and rearward support you need to get it done on the mountain all day. Best Fits a Medium to Narrow Forefoot and Medium to Narrow Shaft of the Leg, CAS (Custom Adaptive Shape) Shell, CAS UltraFit Pro Liner, i-Rebound, 45mm Strap, Quick Instep, Actual Flex: 120, Cuff Alignment: Dual, Warranty: One Year, Ski Boot Width: Medium (99-101mm), Flex: Very Stiff, Used: No, Ski/Walk: No, Forefoot Width: 100mm, Flex Adjustment: No, Buckle Count: 4, Category: Downhill, Ski Gear Intended Use: All Mountain, Instep Height: High, Calf Volume: Standard, Skill Range: Advanced Intermediate - Expert, Model Year: 2019, Product ID: 473820, Model Number: 10178100 265, GTIN: 0888341477343