Salomon X Pro X90 CS Ski Boots Mens Sz 11.5 (29.5) FLEX: Flex: 90 - Medium flex perfect for intermediate or aggressive beginning skiers. Flex Adjuster LINER: My Custom Fit 3D Sport Liner - Super comfortable out-of-the-box fit with 30% thermoformable foam construction. SHELL MATERIAL: TwinFrame Technology - Salomon dials in just the right amount of rigidity where it's needed for performance and leaves the shell softer in other areas to enhance comfort and ease of entry. BUCKLES: 4 Micro Alu Buckles - To micro adjust the length of the buckles for a precise and personalized closure, just turn the lever. Alu buckles are more resistant and have a rich finish, accepted by all athletes because of their confident feel. POWER STRAPS: 35mm Velcro Power Strap