The Salomon X Pro X90 CS Ski Boots is the ideal "transition" boot for new or learning skiers moving on up to the advanced ranks. With a user friendly 90 flex and the unparalleled comfort of Salomon s Custom Shell heat molding system at your disposal, the X Pro line sells more boots in the US than any other model and deservedly so.Fit: Last: 100 mm – An average last for most normal width and volume feet or slightly wider. 360? Custom Shell – Salomons proven heat customization process lets you dial in the fit perfectly.Flex: 100 – A medium flex for intermediate to advanced skiers.Liner: My CustomFit 3D Sport Liner – Superior heel hold and new anti-packing foam.Shell Materials & Design: TwinFrame Technology – Salomon dials in just the right amount of rigidity where its needed for performance and leaves the shell softer in other areas to enhance comfort and ease of entry. Shell – Polyurethane. Cuff – PolyurethaneStance: 24mm Oversized Pivot – Reduced play for extreme precision and direct power transmission. Because many modern all mountain skis are wider, they require more torque to stay on edge. Oversized Pivot answers the need of wider skis.Buckles: 4 Micro-Adjusting Aluminum 3D BucklesPower Strap: 35mm Velcro Power StrapSole: Heel & Toe Removable Sole Pads – Heel and toe pads can be replaced when worn out.