Advanced shell technology attempts to do more with less material, offering increased back support and control of tortion and the body position in the boot. A custom fit is achieved using 2 layers of thermoformable foam on the ankle, heel, meta, tongue & sole, and the cuff is designed to fit anatomically with a woman's lower rear calf for improved fit and comfort. The heel pocket has also been narrowed to more snugly fit a woman's foot, increasing heel lift for better skiing stance.