Faster skiers demand an aggressive boot and thats why Nordica made the Firearrow F3 Ski Boot The flex is stiff but its dynamic That means as you flex deeper into the boot (which happens when you ski faster or make more aggressive turns) the flex increases giving you the support you need By placing the 3rd buckle right at the instep Nordica provides maximum heel hold and also makes it way easier to get in and out Specs Flex Rating Progressive up to 115 Last Width 100mm Skill Level Advanced Features Dynamic progressive flex stiffens as you deepen the flex for more support 45 deg buckle placed at instep for better heel hold and easy on/ off Quick rebound for better power transmission to the ski Dual density PU sole for good grip 3 microadjustable buckles let you dial in the fit Double canting lets you get a balanced and natural stance Soft padded tongue for comfort on your shins Quick set rear spoiler adjusts to fit with your calf PFP Precision Fit shell