The revolutionary asymmetrical concept is based on a different thickness of the shell and liner structures. The inside of the shell is slightly thicker and stiffer and the outside of the shell is thinner and more flexible.
The C.A.S. Shell has an anatomical shape that matches the shape of the foot. This allows for a better out-of-the box initial fit. The dimples on the shell offer less surface tension and facilitate heating, making customizing the shell easier. The shell retains the new shape better and longer.
Utilizes softer plastic over the instep area that allows the shell to open easier as you are entering or exiting the boot.