Flex Index 110 – Softer composite textile shell for comfort and forgiveness Split-Back Upper Cuff with Lateral Flex Zone: Greater lateral flexibility SBR Closed Cell Foam Liner: Rubber boot feel with an exact but comfortable fit 175mm tall cuff height 15 degrees of forward lean Dual Lace Zones: low drag bungee upper, static lower for precision control 6 mm Baseless, zero drop, orthotic footbed: for improved skier to ski balance connection High Strength 6061 Grade Aluminum Plate