Boot Instep Height
Average instep height but due to the sensitive nature of this area of the foot as many blood vessels flow through here it's still important to make sure the blood is not restricted.
Boot Calf Volume
Most common lower leg shaft allowing the boot to wrap around the lower leg for performance as well as comfort.
A soft flex designed to be more forgiving by allowing more flex of the lower leg at the ankle to help maintain balance while skiing.
For the skier who often struggles to find shoes that are wide enough. Typically buys EE or EEE footwear.