Ramp angle which is determined by the longitudinal tilt of the boot board or "zeppa". It is usually a hard foam, plastic, or rubber piece that rests between your inner boot and the outer shell.

Cuff forward lean angle is determined by the upper boot cuff’s forward tilt and together with the ramp angle determines the “net” forward lean which is an important consideration related to ankle range of motion, more specifically dorsi-flexion.

Delta angle is the angle created by the stand height differential of your bindings. You will notice that most bindings’ heels lift the boot heel a bit higher than the toe piece AFD thus creating a slight yet important angle.

Mounting position on the skis. This is the fourth parameter that determines where your boot is placed in relationship to the balance point of the skis.  Sometimes the ideal position is not where the manufacturer has marked the ski for standard mounting.