For the skier with a C, D or E width shoe as most common foot width.
Boot Calf Volume
Most common lower leg shaft allowing the boot to wrap around the lower leg for performance as well as comfort.
Boot Instep Height
Commonly seen with a high arch. While this type of foot provides a stable platform in can cause cold feet as well as numbness if not properly fit.
For a blend of increased power to be transmitted to the ski while maintaining sufficient ankle flex to swallow up varied terrain.