Comfort and Performance. The Vector 120 V2 is a top-of-the-range ski boot for good to expert-level skiers which features a concentration of technology designed for comfort, support and results. It has a generous volume and a width of 103 mm. Its flex index of 120 provides the optimum reactivity required for top-level skiing performance. Its triple-injection PU construction and buckles with micrometric adjustment provide perfect foot support. The Sidas booster strap ensures optimum hold of the upper cuff and tongue and easy tightening.