The Scarpa 4-Quattro Pro Alpine Touring Boot builds its Pebax Rnew cuff taller and thicker than the standard construction, adding the torsional rigidity needed to drive a wider ski with real control. Secure Speedlock 4 locks that stiffness out completely for aggressive turns, then releases instantly when it's time to climb. At a 130+ flex and 100mm last, the boot holds its power through steep, demanding terrain without adding unnecessary weight to the setup. What Our Gearhead(R) Experts Are Saying:"I drove a wider ski than I normally tour on, and the reinforced cuff held its line through every turn instead of twisting out from under me."